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| Palmer p-60 and "blow by" |
| Author |
Message |
    
rlkretzmeier
| | Posted on Friday, June 04, 2004 - 07:05 pm: | 
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I recently exchanged an old and battered P-60 for one that was in better shape in my Islander sailboat.
Now as I run the "new" engine at higher RPM range it has a rather heavy output of oil smoke from the oil fill/dipstick tube. At lower RPM's it is greatly reduced. I have been told its anything from shot rings to a need to clean the oil filler "breather" cap.
Just looking for any comments that this group might have that could help.
Thanks in advance
Bob |
Richard Day
| | Posted on Friday, June 04, 2004 - 10:21 pm: |
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Have you checked the PCV pipe in front of the backfire trap is properly oriented and the connecting pipe is clear? |
rlkretzmeier
| | Posted on Sunday, June 06, 2004 - 06:18 pm: |
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Richard,
Thanks as always for your reply..and since I am challenged..what is the proper orientation for the PCV pipe. Is the backfire trap the same as spark arrestor?, and how best to clean it? Is it inside something..or obvious to the untrained? What about the Oil filler cap..it appears to be filled with some sort of fibrous material..should it be cleaned? And with what?
What is expected compression reading if I can get a compression check on it? |
Richard Day
| | Posted on Sunday, June 06, 2004 - 08:41 pm: |
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On the carburetor intake there is a screened affair that some call a back fire trap others may call it a spark arrestor. Its purpose is to keep you from blowing up your boat if the engine backfires. It operates like the Davey's lamp in that the screen loweres the temperature of the backfire so it is extinguished by the time the blow by gets through it. It should be cleaned occasnionally by loosening the screw that holds it on the carburetor throat. With it removed don't try to start the engine and make sure you pull the coil to distripbutor wire from the ignition coil repeat coil so some some helpful clown or kid won't try to run the engine with the trap removed. Take it out of the boat and off the dock dip in in clean gasoline and then take a compressed air hose and blow the gasoline and any build up of dirt out of the screen. Blow from the side that is closest to the carburetor. The idea being to blow out any accumalated dirt lint etc. that may have been sucked into the screen. Once you have cleaned it you then can put it back on the carburetor throat. Make sure to tighten the set screw that holds it to the throat. Grasp it an make sure it is firmly attached. You don't want the trap blown off by a backfire from the engine. If the strap that holds it to the carburetor throat is broken replace the unit with a new unit This is critical for boat safety and one area the coast guard inspectors will touch to see if the trap is firmly in place. Now that we have located the backfire trap there should be a Positive Crankcase Ventilation device which typicaly is a slotted piece of copper tube that the slotted portion rests on the face of the screen of the trap. When intake air flows over the tube a slight vacuum is created and this vacuum in turn via a piece of flexable tubing typically about 1/2" in dia. is applied to the engine crankcase. You will find on the valve cover plate behind the carburetor at the forward end a steel pipe elbow that the flexable tubing is connected to. The screen in the oil filler cap can be cleaned from time to time by dipping it in clean gasoline off the boat and dock the same way you cleaned the trap. The oil fill cap allows the PCV vacuum to flow air in through the cap and out through the engine.
When the engine runs the carburetor intake air flow sucks the crankcase fumes into the engine and out the exhaust pipe. Some engines came with the slotted pipe permanently welded to the trap outer housing. Others are simply wired in place. Too often the slot is not faced toward the screen and therefore there is no vacuum created and fumes come out the oil fill cap. Some traps have the pick up tube into the side of the trap but in all cases they have to be connected by an unobstructured tube to the valve cover to work. Before buying a lot of trouble make sure yours whatever version it is is in place, properly positioned and connected to the side of the valve cover. Make sure you even have a PCV system. I hope you now understand what the function of the PCV system is all about. I don't remember the IHC recomended Compression pressure will have to look that up. Maybe someone else knows. |
bill falvey
Visitor
| | Posted on Tuesday, August 31, 2004 - 11:20 pm: |
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Richard, Remember me, I bought the fresh water cooling system in the spring for the p-60....well I had other troubles..the engine back sucked water on shut off...turned out it needed a vented loop...solved that problem....then kept flooding, I talked to the guy who rebuilt the engine and he didn't rebuild the carb...found a guy in Philly who rebuilds Modle A and T carbs...great job...remade all the old fittings for the throttle and choke...anyway I'm reading this thread and my crankcase has the pipe forward of the carb but no pipe leads back to the arrestor. Now I was lucky enough to inherit 2 p-60's for parts...one original but runs and the other rebuilt but run dry so cracked block ...stripping the parts...2 very good manifolds..yea for me. anyway one of the engines has the PCV with what you describe a copper pipe led back so it would fit across the face of the arrestor...now can I get rubber hose and lead the opening pipe forward of my carberator back to the arrestor or should I take the crankcase cover with the copper pipe off the other engine and place it on my running engine. I know the rubber tube seems like a lazy way out. But I'm getting to know this engine as well as my wife. (I think you warned me this may happen) ...seems to run ok now but will follow your advice.By the way I got the carb off by grinding down an old timing adjustment wrench and fitting it between the engine compartment wall and the manifold...about 3 inches of working room. Thanks again ...Bill |
richardday
Senior Member
Username: richardday
Post Number: 294
Registered: 11-2003
| | Posted on Wednesday, September 01, 2004 - 09:32 pm: |
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Bill, get a short length of neoprene or fuel line
Hose and make up a small length of 1/2"copper pipe with the outboard end capped off. The inboard end connects to the vent on the valve cover of the engine. make a series of holes or a slot is even better about 1/4" wide and the length of the width of the backfire trap screen. mount this so air flow over the pipe into the carburetor inlet will create a vacuum in the hose and therebye suck air into the oil filler cap through the crankcase and out the exhaust pipe. Do not open the backfire trap screen as that could allow a backfire to get past the screen. I hope this helps. Curious the number of people that have this same problem with their PCV in the P-60. Remember the slot goes next to the screen otherwise no vacuum is created in the crankcase. |
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