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Old 04-24-2015, 10:17 AM
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Cannon51 Cannon51 is offline
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Default 1641 blowing engine oil
I ran the 1641 a while yesterday an noticed some smoke. I don't think it was coming out of the exhaust as much as on the exhaust. I'm hoping it just the dipstick seal but there is some black residue at the head gasket. The oil on the engine is clean. I took the air filter off and no smoke or oil is coming out the PCV tube. I'm planing on changing the dipstick seal and see what happens, is that right or wrong. The engine runs fine.
Cannon
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Old 04-24-2015, 10:34 AM
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Sam Mac Sam Mac is offline
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BTDT, head gasket is my bet on this one. The way I tested to find out what was going on was to use the adapter from my compression tester hooked up to my shop air, screw it into the spark plug hole and turn the air on. You need to pull the valve covers and turn the engine over till the piston is at the bottom of it stroke. The one I had was blowing air up through the oil return from the head.
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Old 04-24-2015, 10:57 AM
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Cannon51 Cannon51 is offline
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Not really what I wanted to hear. I guess that's a engine out of the tractor job. Looking at your picture I can tell that part of my dipstick seal is missing.Thanks
Cannon
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Old 04-24-2015, 11:03 AM
Mike McKown Mike McKown is offline
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Not really what I wanted to hear. I guess that's a engine out of the tractor job.
I believe I'd rather find a blown head gasket than some of the other expensive things I can think of.
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Old 04-24-2015, 11:10 AM
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Sam Mac Sam Mac is offline
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They are pretty easy engines to work on. Test it first. Reason the one I showed blew is that it had a mouse condo in it and it got hot. If you need the service manual I have a copy and I know J-Mech has one also cause I got my copy from him.
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Old 04-24-2015, 11:14 AM
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True, it's not a rod through the block or anything.
Cannon
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Old 04-24-2015, 11:29 AM
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Just a quick thought, spray it off (Dipstick area) with what ever cleaner and run it a bit,
if all the stars line up and it is your lucky day, maybe it is the dipstick o ring as you thought.
Cheap quick and easy check, with nothing to loose but a few minutes.
LUCK!!
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Old 04-24-2015, 11:33 AM
Mike McKown Mike McKown is offline
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They are pretty easy engines to work on. Test it first. Reason the one I showed blew is that it had a mouse condo in it and it got hot. If you need the service manual I have a copy and I know J-Mech has one also cause I got my copy from him.
Likewise on the mouse condo + an oil leak. I got this engine on a used tractor. I'm fairly certain the head gasket is blown on the starter side of the engine as there is a heavy, burnt oil stain between the head and block. When I first started it, it smoked like a crop duster and I think that's why the tractor was junked. Well, it had two bent pushrods too. I cleaned the fresh oil and mouse cotton/pee off the engine, put a rear crank seal in it and fired it up. Seems to run good now but I still get some intermittent smoking out the exhaust.

I've used the air pressure trick on other engines. It works.

I changed a head gasket on one Vanguard. Best I remember, I didn't pull the engine, just slid the blower housing back and took the bolts out of the intake manifold/head and pulled the head off.

I've replaced head gaskets on 3-4 Kohlers/Vanguards in the last few years. Without exception, all of them had the cooling fins blocked so I'm pretty certain overheating was the cause.

These pictures are of the Vanguard I described above.
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Old 04-24-2015, 11:45 AM
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Just a quick thought, spray it off (Dipstick area) with what ever cleaner and run it a bit,
if all the stars line up and it is your lucky day, maybe it is the dipstick o ring as you thought.
Cheap quick and easy check, with nothing to loose but a few minutes.
LUCK!!
I did that, it's definitely leaking at the dipstick seal. I could see it coming out and blowing up the side of the tube. I guess that doesn’t rule out a head gasket leak, judging by the stain at the gasket.
Sam I think I built something a few years ago to check a chainsaw case for leaks. I believe I had to use a regulator to lower the line pressure.
Cannon
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Old 04-24-2015, 11:51 AM
Justin Witt Justin Witt is offline
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Not really what I wanted to hear. I guess that's a engine out of the tractor job. Looking at your picture I can tell that part of my dipstick seal is missing.Thanks
Cannon
You shouldn't have to take the engine out just to replace head gasket should you? I would thing there would be enough room.
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