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onelung
New member
Username: onelung
Post Number: 2
Registered: 12-2014
| | Posted on Friday, December 12, 2014 - 11:28 pm: | 
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I am interested in finding a Lathrop engine. Any suggestions?
Thank you |
ernie
Senior Member
Username: ernie
Post Number: 1916
Registered: 01-2002
| | Posted on Saturday, December 13, 2014 - 08:02 am: |
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HI,
They are around but we need to know
What size, what condition what style |
onelung
Member
Username: onelung
Post Number: 4
Registered: 12-2014
| | Posted on Saturday, December 13, 2014 - 09:23 am: |
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I don't know the entire Lathrop engine line-up. But I was hoping to find a one or two cylinder weighing under 1000 lbs and in any condition. The engine does not have to be operational. I was hoping to find one complete or "mostely" complete.
I am a marine engineer, so I have the knowledge to rebuild.
Being a mystic resident I will be proud to have one of our Lathrop engines come home and receive the love and attention it deserves. |
ernie
Senior Member
Username: ernie
Post Number: 1918
Registered: 01-2002
| | Posted on Saturday, December 13, 2014 - 12:11 pm: |
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I have a 4 or 5 HP early 2 stroke freshwater engine. It has been partially apart for many years and will need to be sleeved. However the water jacket is good. Most salt water Lathrops are junk due to salt water and the fact that Lathrop never put any nickel in the castings.
It is missing the oilers grease cups and check valve. I most likely have a carb.
It has a tag with SN but no HP
Click on my name to the right and send me your e-mail and I will send you pics. The engine is in Taunton. |
onelung
Member
Username: onelung
Post Number: 5
Registered: 12-2014
| | Posted on Saturday, December 13, 2014 - 12:19 pm: |
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[email protected] |
ernie
Senior Member
Username: ernie
Post Number: 1919
Registered: 01-2002
| | Posted on Saturday, December 13, 2014 - 02:39 pm: |
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Richard,
Any idea what it is?
I think the bore is 4.5
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ernie
Senior Member
Username: ernie
Post Number: 1920
Registered: 01-2002
| | Posted on Saturday, December 13, 2014 - 02:47 pm: |
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3417
Registered: 11-2001
| | Posted on Saturday, December 13, 2014 - 03:51 pm: |
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Lathrop spec sheet for single cylinder
I'll try to get an approx. mfg date by the
tag style ?
Engines with no numbers on tag, some had numbers stamped on top of cylinder block between stud bolts ?
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3418
Registered: 11-2001
| | Posted on Saturday, December 13, 2014 - 08:31 pm: |
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This tag on the above lathrop
Appears to be the earliest style tag,
last used in late 1906 early 1907.
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onelung
Member
Username: onelung
Post Number: 6
Registered: 12-2014
| | Posted on Sunday, December 14, 2014 - 11:15 am: |
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Ernie, Can you please find the other components of the engine not pictured? (Head, carb, etc)
I plan to see you the after Christmas with my trailer and some boards to create a ramp for easy loading.
Should I build a base to hold the engine during transport, if so; can you please tell me the diameter of the flywheel ("A") and the width of the mount ("K"). That way I can construct a skid before coming to see you.
Thanks again,
Rob |
onelung
Member
Username: onelung
Post Number: 7
Registered: 12-2014
| | Posted on Sunday, December 14, 2014 - 11:22 am: |
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Richard,
Thanks for posting the Lathrop spec sheet.
Rob |
ernie
Senior Member
Username: ernie
Post Number: 1923
Registered: 01-2002
| | Posted on Monday, December 15, 2014 - 04:52 pm: |
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NO base needed for transport back to Mystic
No ramps needed either as I have a means of levitating it
All the parts are in one spot already
Give me a hollar when you are ready
I am not around the 26th |
miro
Senior Member
Username: miro
Post Number: 784
Registered: 11-2001
| | Posted on Tuesday, December 16, 2014 - 08:58 am: |
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It's great to hear of an engine going to a "good home" to resurrection
miro |
david_doyle
Member
Username: david_doyle
Post Number: 30
Registered: 03-2013
| | Posted on Tuesday, December 16, 2014 - 10:27 am: |
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Looking forward to, hopefully, watching this one come back to life. |
onelung
Member
Username: onelung
Post Number: 9
Registered: 12-2014
| | Posted on Saturday, December 27, 2014 - 07:49 pm: |
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Serial number is 213 or 2138, hard to tell exactly.
Any one have an idea of vintage?
Restoration starts tonight..... |
onelung
Member
Username: onelung
Post Number: 10
Registered: 12-2014
| | Posted on Saturday, December 27, 2014 - 07:54 pm: |
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See image |
onelung
Member
Username: onelung
Post Number: 11
Registered: 12-2014
| | Posted on Sunday, December 28, 2014 - 01:35 am: |
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Note: The flywheel is 17-1/4 diameter and the cylinder bore is 4-1/2 ID |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3432
Registered: 11-2001
| | Posted on Sunday, December 28, 2014 - 01:04 pm: |
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The photo of the stamped number is appreciated !
In years of attempting to put a mfgr date on Lathrop 2 Strokes this is only the second early number that I have seen. It appears that early engs had 4 digit numbers and were stamped on top of block. The number in above post ( # 2138 ) certainly looks to be 4 digits even though the last number is questionable. The other engine with a 4 digit number ( # 1447 )IS in my collection and is a complete engine.
As was discussed in above posts These unnumbered name plates ceased in 1906-7 so at this point these engines were manufactured from about 1898 to 1906-7 so about a 8- 9 year period, with only two examples and no production numbers available yet its still not possible to have very exact information ?
Anyone with one of these old Lathrops that could post photo or any information would be appreciated !
This is the tag style that succeeded the unnumbered ones 1906-7 the lowest number in my files is this one ( #15641 ). if anyone has low numbered tags of this style a photo would be appreciated ?
About 25 years ago seeing an old Lathrop marine engine in a prominent maritime museum with a date on a plaque I asked how the manufacturing date was
assigned and the curator said it was thought to be that age by the doner ? eventually it was found to be about 20 yrs amiss the real mfg date !
That started my interests in putting a little more reality into dating all of our Beloved Old Marine Engines-- Still a lot of work and long way to Go !!!
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billschaller
Senior Member
Username: billschaller
Post Number: 605
Registered: 12-2003
| | Posted on Monday, December 29, 2014 - 07:01 pm: |
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mine. bought to put out as a lawn ornament.
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3433
Registered: 11-2001
| | Posted on Monday, December 29, 2014 - 07:49 pm: |
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APPRECIATE THE POST !
Do you suppose the second digit is a 6 or an 8 ?
That piece of iron would keep the mailbox from blowing away.
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billschaller
Senior Member
Username: billschaller
Post Number: 606
Registered: 12-2003
| | Posted on Monday, December 29, 2014 - 08:16 pm: |
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My guess is it is a 6, but I never really looked at it. It's a midwest engine, so after I hauled it home, I decided a salt free motor like that deserved to be inside. I do own a salt damaged one, it is real pretty.
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3434
Registered: 11-2001
| | Posted on Monday, December 29, 2014 - 10:17 pm: |
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Very nice engine and wooden base !
Older Lathrop with single
oiler, what's the serial number ?
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ernie
Senior Member
Username: ernie
Post Number: 1936
Registered: 01-2002
| | Posted on Tuesday, December 30, 2014 - 09:49 am: |
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Richard,
The pic above is the last style that Lathrop built.
The following make it the latest or last style
1 flywheel puller nut, also the bolts in it shouldn't be there. Either the flywheel nut isn't properly tightened or by coincidence the holes in the nut and the flywheel lined up so they could be installed. Either way they aren't needed. The holes are to tighten or loosen the nut with a special wrench. The once the nut was loosened bolts were used to pop the flywheel off the tapered crankshaft.
2 round side covers
3 transfer passage/port on the side instead of the front. Piston baffle is fore and aft not crosswise
4 just for info the oiler isn't original. Lathrop used nickle plated oilers and this engine should have a double one. There should be a place for the oil tube to go in just above the check valve on the other side cover. |
ernie
Senior Member
Username: ernie
Post Number: 1937
Registered: 01-2002
| | Posted on Tuesday, December 30, 2014 - 09:55 am: |
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Here are pics of the oil line and where it enters the engine as well as the correct oiler.
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3435
Registered: 11-2001
| | Posted on Tuesday, December 30, 2014 - 10:57 am: |
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Ernie I agree I shouldn't have used the word Older without looking closer at engines physical traits ! The serial number will put it close to its year of mfgr.
One of my endeavors with Lathrop 2 strokes is to list these differences of these physical traits to serial numbers.
The oldest engines had no side inspection plates, some were hot heads, early side plates were square on bigger engs, round on smaller ones, they had no oilers or prelube oilers in the plates.
these photos of circa 1920 engines ( should be 5 digit serial numbers first two being 15 or 16 )
Bills lawn ornament is a 16447 so its early 1920's ?
these engs had dual oilers but was in crankcase in two different locations ?
The more lathrop engine photos with a serial number I can record will help get them in catagories and eventually help assigning a manufacturing year !
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speedboy
Member
Username: speedboy
Post Number: 17
Registered: 08-2007
| | Posted on Tuesday, December 30, 2014 - 02:09 pm: |
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Richard, here is another 4 digit serial number |
ernie
Senior Member
Username: ernie
Post Number: 1938
Registered: 01-2002
| | Posted on Tuesday, December 30, 2014 - 04:42 pm: |
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Richard,
Neat add
I had always thought the round side cover engines had a flywheel nut.
Thanks for the additional info
Ernie |
billschaller
Senior Member
Username: billschaller
Post Number: 607
Registered: 12-2003
| | Posted on Tuesday, December 30, 2014 - 09:06 pm: |
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name plate
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3436
Registered: 11-2001
| | Posted on Tuesday, December 30, 2014 - 10:25 pm: |
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Dan Thanks for the post, that is the highest 4 digit serial number in my files so far and the only 4 digit number on a 1907 style name plate !
Can't pinpoint its age yet but I would say this engine is well over 100 yrs old maybe 105 Yrs ?
Does the engine have square or round inspection plates, were they machined for oilers ?
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3437
Registered: 11-2001
| | Posted on Tuesday, December 30, 2014 - 10:38 pm: |
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Bill the #23799 Engine in the above post falls right on the 1927 time line- again not exact but close !
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onelung
Member
Username: onelung
Post Number: 12
Registered: 12-2014
| | Posted on Wednesday, December 31, 2014 - 01:11 am: |
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Disassembly worker  |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3438
Registered: 11-2001
| | Posted on Friday, January 02, 2015 - 06:32 pm: |
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The engine in above post ( Serial # 2138 ) seems to have a casting covered by a rectangular 4 bolt plate just above the water inlet, it appears to have been capped off ?
Don't have a photo of rear but I believe the exhaust port is there ?
I don't find this on any other Lathrop that has a separate exhaust port ??
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ernie
Senior Member
Username: ernie
Post Number: 1939
Registered: 01-2002
| | Posted on Saturday, January 03, 2015 - 09:24 am: |
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The cover on the side is to make it a 3 port.
I took the cover off thinking I would be able to inspect the water jacket and when it was removed I was looking at the piston skirt
The exhaust is aft with 4 bolts |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3439
Registered: 11-2001
| | Posted on Saturday, January 03, 2015 - 01:03 pm: |
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This is the only evidence of a Lathrop
three port engine That I have seen ? It probably puts this #2138 engine back before 1905 when Joseph Day was charging U.S. mfgrs a fee to use his English three port patent. See list in This post!
http://www.oldmarineengine.com/discus/messages/1/93671.html#POST14780
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ernie
Senior Member
Username: ernie
Post Number: 1940
Registered: 01-2002
| | Posted on Saturday, January 03, 2015 - 03:28 pm: |
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Richard,
Where is Lathrop in a list in the link?
Lots of fine print and my eyesight isn't what it used to be?
Thanks
E |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3440
Registered: 11-2001
| | Posted on Saturday, January 03, 2015 - 03:48 pm: |
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Ernie
Lathrop is not in the list, the mfgrs that paid Day to use the three port patent are in the list--- Lathrop didn't pay and ceased making three port engs, probably dating this lathrop # 2138 closer to 1904 ? not certain of this but is a bit more info that helps narrow the year of mfgr ??
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ernie
Senior Member
Username: ernie
Post Number: 1941
Registered: 01-2002
| | Posted on Saturday, January 03, 2015 - 05:23 pm: |
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OK makes sense
Thanks |
onelung
Member
Username: onelung
Post Number: 13
Registered: 12-2014
| | Posted on Monday, January 05, 2015 - 01:21 am: |
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Rear port |
richardday
Senior Member
Username: richardday
Post Number: 1109
Registered: 11-2003
| | Posted on Monday, January 05, 2015 - 11:39 am: |
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I had a large two cylinder 2 stroke Lathrop and it had a serial number under the head gasket on top of the forward cylinder. The bell housings for the crank shaft had a serial number on the Port outer rim. As I remember it the bell housings all had serial numbers on their outer rim. The bottom of the Port water jackets each had a cast iron rectangular cover bolted in place about 4X3X3/8" inches thick and behind it were large sacrificial zincs They were just small enough to allow easy replacements by taking off the the cast iron cover. They each had 4 legs about 1/2" dia by 1" long. Presumably this was to keep the zink from moving about once installed. |
richardday
Senior Member
Username: richardday
Post Number: 1110
Registered: 11-2003
| | Posted on Monday, January 05, 2015 - 11:42 am: |
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I had a large two cylinder 2 stroke Lathrop and it had a serial number under the head gasket on top of the forward cylinder. The bell housings for the crank shaft had a serial number on the Port outer rim. As I remember it the bell housings all had serial numbers on their outer rim. The bottom of the Port water jackets each had a cast iron rectangular cover bolted in place about 4X3X3/8" inches thick and behind it were large sacrificial zincs They were just small enough to allow easy replacements by taking off the the cast iron cover. They each had 4 legs about 1/2" dia by 1" long. Presumably this was to keep the zink from moving about once installed. |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3445
Registered: 11-2001
| | Posted on Monday, January 05, 2015 - 12:34 pm: |
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Dick
I looked at my lathrop records and about 15 years ago listed Your Old Lathrop twin with 4 digit serial Numbers, # 3708 and #3709
approx. mfg date 1907-08.
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