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RichardDurgee
Senior Member
Username: richarddurgee
Post Number: 2875
Registered: 11-2001
| | Posted on Monday, July 16, 2012 - 12:54 pm: | 
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Just back from a few weeks in North Florida
Found this Palmer ZR2 in a barn, its supposedly never been run in a boat ? It has no indication it was ever painted ? its missing the timer,magneto and compression lever, all other details are factory correct. I dont have a catalog as new as this engine and I don't find photo of a wet intake manifold ?
the original tag is still on the oil filter, engine oil clear as new, and it turns over very smooth.
Removed plugs to oil cyls before turning and thumb test said no compression rear cyl ? removed head and only black soot no carbon and no indication it ever ran,although the soot says someone attempted to start it, wipped piston with cloth and dome shined like brand new piston.
Exhaust valve went up and down with rotation of flywheel but remained 1/8 inch from seating ? checked adjuster and it was adjusted fully closed so it seems that the original valve stem was to long and it got past inspection, a little grinding of stem and .025 cold clearance should have a runnable New old Palmer ?
Tag says 1943 what Bosch magneto was fitted to the engine originally ?
All info I have shows a Zenith carb but the schebler has all indications its was factory installed ?
Timer base thats still there indicates Cuno but all info on 1943 engs indicates Atwater Kent or Delco distributor cap type timers ?
Any help with questions appreciated !
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J.B. Castagnos
Senior Member
Username: jb_castagnos
Post Number: 707
Registered: 07-2002
| | Posted on Monday, July 16, 2012 - 07:42 pm: |
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Richard, could the compression release be holding the valve open? Don't know how they work on these engines, just a thought. Looks like a nice find. |
RichardDurgee
Senior Member
Username: richarddurgee
Post Number: 2876
Registered: 11-2001
| | Posted on Monday, July 16, 2012 - 09:29 pm: |
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J.B.
Good point,
Had several Grandkids with me for summer vacation and some had to get home so I ran out of time, anxious to get back to it !
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Ernie
Senior Member
Username: ernie
Post Number: 1534
Registered: 01-2002
| | Posted on Tuesday, July 17, 2012 - 07:31 am: |
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Comp release bumps th ex valve open a bit in the comp stroke. There should never be zero comp.
I have parts if you need them
Ernie
Oh yea neat find! |
Richard A. Day Jr.
Senior Member
Username: richardday
Post Number: 1011
Registered: 11-2003
| | Posted on Tuesday, July 17, 2012 - 12:13 pm: |
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To me the most interesting trim on this ZR-2 is the heated intake manifold. Seen a lot of ZR-2 but never one with this style.
Note the intake breather is missing and a oil pipe plug has been inserted. The bump on the exhaust cam operates with the compression lever pushed aft. Reduces compression so stomping on the flywheel is easier. Pull forward to run. Nice find. Expect it had a Detroit type distributor from wrecks I have seen. Most watermen changed the post WWII disk flywheel to a spoked used flywheel. Apparently they gave up making spoked flywheels during WWII because the yield in the foundry with inexperienced moulders was unsatisfactory!! Nice find! |
Richard A. Day Jr.
Senior Member
Username: richardday
Post Number: 1012
Registered: 11-2003
| | Posted on Tuesday, July 17, 2012 - 02:02 pm: |
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Sorry the line Note the PCV intake breather is missing and an oil pipe plug has been inserted. |
RichardDurgee
Senior Member
Username: richarddurgee
Post Number: 2877
Registered: 11-2001
| | Posted on Wednesday, July 18, 2012 - 12:40 pm: |
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Replys are appreciated- THANKS
Quick thought on compression release, seems if
cam is in relase position it would affect both ex valves ? will look into it.
Dick, I have never seen a ZR engine or photo of one with the PCV air horn so will see what I can do to at least vent it and try to locate an original.On the aft of the reverse gear there is
a 3/8 open pipe sticking up I guess a vent to the gear box ?
Missing the Mag and the distribtor and reaearching I found reference that the engines would drop 20 % or so of rpms if operated on a single spark plug -- did these engines run on both mag and battery ignition at the same time ?
not exactly sure how advance and retard could be coordinated ?
Well it is a relief and diversion to have something to think about other than politics ??
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Ernie
Senior Member
Username: ernie
Post Number: 1537
Registered: 01-2002
| | Posted on Wednesday, July 18, 2012 - 01:02 pm: |
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Correct comp release will affect both vlaves.
As to timing the mag had an inpulse coupling for starting and after that the timing was what ever it was set at. I guess it was up to the operator to get the timing close between the mag and timer.
As to RPM drop I think 20% was advertising fluff.
Think of the RPM drop when you do a mag check on a Cessna or Piper. What is acceptable? I seem to remember 100 RPM with a max of 175 at 1800 RPM If my calculations are correct 20% of 1800 is 360
I thought the beather on the twins was just an elbo with some steel wool stuffed in it. They really didn't breathe as the crankcase pressure was always pretty even as 1 piston was on its way up while the other was on its way down.
I will look a PNR2 tonight that I know is original.
Richard your engine being as late as it is the tube to the intake makes sense and there would n't have been any crankcase fumes in the engine room |
Ernie
Senior Member
Username: ernie
Post Number: 1538
Registered: 01-2002
| | Posted on Thursday, July 19, 2012 - 07:27 am: |
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The PNR2 had a Palmer breather valve for a single cylinder L or R with no internal parts. The sincle cylinder valves were a check valve so with the internal parts missing all it does is seperate the oil fumes from the air |
