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 > Kohler 5CKM21 no compression in both cylinders

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enblethen

Moses Lake, WA

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Posted: 09/10/21 01:34pm Link  |  Quote  |  Print  |  Notify Moderator

I wish we would get some rain!


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Gjac

Milford, CT

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Posted: 09/13/21 07:29am Link  |  Quote  |  Print  |  Notify Moderator

Removed all the shroud's around the genset on Sat to see what I could get too. Framing and spare tire had to come out also. After extensive research and multiple calls to people that work on small engines and gensets no one would work on one in an RV. I did not pull head because I could not find a head gasket or internal parks for this 25 year old genset they all say discontinued. Still waiting to hear from the Kohler rep he was not working Fri and Sat. Thought maybe I could get to an access cover to check cam shaft but could not. Someone suggested maybe the internals of the muffler collapsed clogging the muffler, found no rattling inside and when I cranked engine over the exhaust sucked my hand in instead of blowing it out. Also air and gas are coming out of intake instead of sucking in. Almost like in was running backwards.

enblethen

Moses Lake, WA

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Posted: 09/13/21 07:48am Link  |  Quote  |  Print  |  Notify Moderator

It could be a pulled exhaust, rare!Our other discussion came up with CH20 engine, correct?
Kohler gaskets

Gjac

Milford, CT

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Posted: 09/13/21 11:10am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

It could be a pulled exhaust, rare!Our other discussion came up with CH20 engine, correct?
Kohler gaskets
No it is a Command M-20EP. Very hard to find info on this engine. What is a pulled exhaust?

enblethen

Moses Lake, WA

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Posted: 09/13/21 11:19am Link  |  Quote  |  Print  |  Notify Moderator

This one?
m-20
That should have been "plugged" exhaust.
Can you get muffler off?

Gjac

Milford, CT

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Posted: 09/13/21 11:34am Link  |  Quote  |  Print  |  Notify Moderator

Muffler is not plugged because I can feel my hand being sucked in at the tail pipe instead of air coming out. It is like the engine is turning over backwards. I have heard of small engines doing this like in a lawn mower when it stops suddenly like when it hits something. Does anyone know which way the fly wheel should turn?

Gjac

Milford, CT

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Posted: 09/15/21 08:58am Link  |  Quote  |  Print  |  Notify Moderator

I am not sure how this is related I thought it was just coincidence at first and it maybe, however as I stated in the OP the 12v supply wire to the fuel shut off broke and the plunger would stop the flow of fuel to the engine and the engine just shut off, no fuel to the cylinders and engine of course would not start. It just seems strange to me the problem started when this wire broke. After reconnecting the wire and verifying the solenoid was good the no compression and fuel coming out of the intake and exhaust sucking in instead of blowing out occurred. Is this just coincidence or is there something I am not seeing? Does anyone know if this genset has an electronic decompressor?

bgum

South Louisiana

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Posted: 09/16/21 07:40am Link  |  Quote  |  Print  |  Notify Moderator

Try disconnecting the wire and start.

Gjac

Milford, CT

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Posted: 09/16/21 08:17am Link  |  Quote  |  Print  |  Notify Moderator

bgum wrote:

Try disconnecting the wire and start.
If you are talking about the wire to the fuel shut off(anti dieseling solenoid) I have done that. Also removed the fuel shut off solenoid to see if the plunger comes down when the starter button is pushed and it does.

wa8yxm

Davison Michigan (East of Flint)

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Posted: 09/16/21 03:58pm Link  |  Quote  |  Print  |  Notify Moderator

YOu said no compression but you said it's sucking air in the exhaust.. This is a clue. Story or two (2nd one short)
Reading Gus Wilson's Model Garage (Series in popular Mechanics) back in High School he had a car brought in with what they thought was a blown head gasket. Well he confirmed two cylinders not working and as I recall it was the intake valves. or perhaps I'm mixing the two stories it was the intake)
He screwed a spark plug housing with the plug broke out and a air chuck brazed in into the spark plug hole and put compressed air to it and noted where it came out(I am confused it was a blown head gasket, Radiator bubbled)

My car it was the intake valves (That's how the mechanic figured it out)

Sounds like the exhaust valve on yours based on the sucking (the power stroke)


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


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