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| Dunn Marine Motor Ignition Help |
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richarddurgee
| | Posted on Tuesday, April 15, 2003 - 12:18 am: | 
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Am reassembling a circa 1916 twin Dunn Marine Motor,the base and points to the timer are there but it is missing the Rotor and cap. I say timer but it really must be a distributor for it seems to have three spark wire connectors in cap and whats left of a rotor. By comparing pictures of other distributors it looks to be a Rhoades Unit Spark system made by New York Coil Co.they seem to have put the brass I.D.tag on the cap itself.any help would be appreciated in locating cap and rotor or I would buy complete distributor IF available.This is the Best picture I could find.
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Richard Day
| | Posted on Tuesday, April 15, 2003 - 07:16 am: |
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Dick thats a tough one. Never have seen one or even peices of one. Good luck. |
Tom Stranko
| | Posted on Friday, May 02, 2003 - 09:54 am: |
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Richard, I'm attaching a picture of the original timer on my 2 cylinder Dunn. It has 2 contact points to operate 2 spark coils. It might be easier to find this item.  |
Tom Stranko
| | Posted on Friday, May 02, 2003 - 09:59 am: |
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Richard,
If you have any nice Dunn catalogs I would sure appreciate copies or scans I could print. All
I have been able to find are the small ads in old boating magazines. I have other orinigal inboard catalogs I could copy or scan for you.
Thanks
Tom |
richarddurgee
| | Posted on Monday, May 05, 2003 - 02:20 pm: |
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Tom, Thanks for picture , I saw the timer when posted before but can't find an ad or catalog pic of one like it anywhere ? Will have to adapt a timer to mine to run it , but always trying to get them back as original as possible. The singles had timer on flywheel end of the crankshaft, the triples and bigger had timer on rear of crankshaft, the twins seem to have been the orphans and had different timers on them at different mfg years.
Yours may be the only original I've ever seen on a twin.
I have a 1910-11 catalog and a 1916-17 catalog.have tried all local printers in my area but none want to copy these old timers at a reasonable price (I Keep Trying) Get my e-mail
address from Andrew and e-mail me i'll be happy to scan both of them for you !
The significant difference in these engines from 1910 to 1916 was the separate intake and exhaust on the early ones and by 1916 they all had the single unit exhaust /intake manifold like your engine and the one I have. Don't know what year in between the change actually occured.
I have an old Dunn single that has the spark plug horizontal through the cylinder /not in the head, I guess its older than the 1910 catalog!
Thanks Richard |
richarddurgee
| | Posted on Monday, May 05, 2003 - 02:55 pm: |
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This is 1910-11 Dunn twin, can compare to 1916 above in earlier post !
This is 6 cylinder from 1910-11 catalog (Not in 1916)
all 1910 engines had solid flywheels by 1916 the familiar four holes appear!
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Richard Day
| | Posted on Tuesday, May 06, 2003 - 10:26 am: |
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Richard, Hope the operation went well. We missed you at Calvert. As it turns out the weather was really very good. Cool on both days and no rain. Great turn out and the food was excellent. Looking forward to next year. |
richarddurgee
| | Posted on Tuesday, May 06, 2003 - 05:43 pm: |
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Dick, 4 days out of knee surgery and recovering
fast. Will have to be more careful getting on and off boats and maybe not lifting the real heavy STUFF anymore.
What a time for it to happen ! For me, Missing Dick Day's Calvert Marine Engine Show is kinda like asking a kid to skip Christmas !!
Sounds like it was another great weekend and I'm looking foreward to the pictures being posted.
Thanks Richard |
Tom Stranko
| | Posted on Thursday, April 15, 2004 - 09:32 am: |
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I notice the picture put on by Richard of the 1916 and later Dunn has a "oil-grease shield" the has the mottled or speckled appearence of a
zinc (galvanized) coated steel.
The shields on my Dunn are what seem to be well used (maybe original) shields that are indeed galvanized.
I also notice that the earlier engines seem to show a very light colored head and valve body.
This could have been nickel plating. The illustration from Richard of the newer engine, shows the head/valve body about the same shade as the rest of the engine. I can find no trace at all of plating on my heads (they were never ground or polished at all) so I deduce that they went "cheap" later and just painted those parts.
The picture I am attaching shows my shields |
Tom Stranko
| | Posted on Thursday, April 15, 2004 - 09:34 am: |
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richarddurgee
| | Posted on Thursday, April 15, 2004 - 11:22 am: |
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Tom
I looked closely again at these old Dunn catalogs
and the engs did look as if the heads and flywheel rims were different colors, can't determine whether they were just painted two tone, polished or plated ? some of the old Co.'s
did give you finish options at xtra cost. maybe they did a few for catalogs. My eng like yours was no frills all paint and very rough castings.
This the only other Dunn II i've ever seen, its in a museum wharehouse,looks like our engs.
The side covers in the old catalogs state they were aluminum, they do look different in later catalogs (speckled) looks to be galvanized metal?
I appreciated the photo info you sent me about the threaded pins used by Dunn to secure the wrist pins, sure that it will save me time and maybe a little grief.
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