PT422 Engine shaking / sputtering
- Thread starter KMA
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MossRoad
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- Power Trac PT425 2001 Model Year
Yes. Sometimes you can turn the flywheel or a pulley of a belt driven implement. However, with PTs, there are hydraulic pumps attached directly. I do not know your engine configuration so I can't tell you how to turn it. You are on the right track, though. :thumbsup:
Okay so I adjusted the rocker arms according to the service manual. I push on the spring and the valves move and return to a rest in the closed position when at TDC. I put the cover back on and tried the compression test... still nothing. Anyone have an idea what could cause one cylinder (with working valves) to have zero compression while the other seems fine? The needle on the compression gauge doesn't even budge on the bad side. The only thing I can think of is a broken connecting rod. Does that make sense?
Taking it to a service shop is going to be a challenge without the engine running. I can probably get it up on the trailer using my ATV winch, but getting it off and around the repair shop will be tough. I'll feel like I'm at their mercy if I pull the trigger and take it in.
I really appreciate everyone's input. Thanks again.
Taking it to a service shop is going to be a challenge without the engine running. I can probably get it up on the trailer using my ATV winch, but getting it off and around the repair shop will be tough. I'll feel like I'm at their mercy if I pull the trigger and take it in.
I really appreciate everyone's input. Thanks again.
Gravy
Platinum Member
KMA,
I suspect that you may have a piece of carbon holding that exhaust valve open. That could explain both the extra clearance and the total lack of compression. If that is the case, your current adjustment will be too tight when the carbon is gone. A broken connecting rod would most likely be sticking out the side of the engine.
If I'm right, the trick is figuring out how to remove that carbon. Sometimes a slow trickle of water or ATF through the carb while the engine is running will do the trick.
I suspect that you may have a piece of carbon holding that exhaust valve open. That could explain both the extra clearance and the total lack of compression. If that is the case, your current adjustment will be too tight when the carbon is gone. A broken connecting rod would most likely be sticking out the side of the engine.
If I'm right, the trick is figuring out how to remove that carbon. Sometimes a slow trickle of water or ATF through the carb while the engine is running will do the trick.
Yeah, that could explain it. I'm thinking about taking off the cylinder head to get a better look at things. Thanks!
On a side note: has anyone pulled the engine out of a PT422? I'm thinking about taking it out to work on it in my garage if I need to do more tear down. Plus, I figured I could take it to a repair shop that way. Sound like a bad idea?
MossRoad
Super Moderator
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- Power Trac PT425 2001 Model Year
It could be a broken connecting rod or even a hole in the piston. You don't have a compression release on that engine, do you?
Marks481
Platinum Member
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- May 29, 2005
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- Power Trac 422 (2005)
Here is a thread on removing the Kohler 25 from the PT425. Read down to Johara's comments, since he commented on the newer design which has all the pumps bolted together on one side of the engine.
http://www.tractorbynet.com/forums/power-trac/37100-pt-425-engine-removal-procedure.html