Hi
I have a Cub Cadet LT1046 with a 23hp CV23S Kohler commander V-twin (Spec # 75604)
A couple of weeks ago I almost finished mowing my lower back yard, about 1.5 acres, when it suddenly stopped. After some trying it started again, but blew clouds of light blue smoke.
It also made a cracking noise, like something cracked/broke. Shut it down quick.
What I found/did so far:
Spark plugs look oily. Cleaned the plugs, I get a blue spark when I test them. It fires fine with fuel down the carby, so I assume spark is ok, at least short term.
Checked fuel line, pump & solenoid fuel to carby OK (actually now I think about it when removed solenoid, fuel runs out, so fuel getting through). Thoroughly cleaned carby - jets, float and all look ok.
Borrowed a compression tester and it tested at 165 and 175 psi - manual states 165 psi.
I did a bit of a DIY leakdown test using compressor. The only noticeable air is when I put my finger over the breather - after a short while I release it and some pressure has built up.
I put fuel down the carby again and it fires up for a few seconds, then stops. Blows a lot of blue smoke.
Someone suggested head gasket. Heads off - old head gaskets, reed valves look OK.
I tried with new gaskets first on 1, then on 2. It does not run for more than a few seconds with the new gaskets. Still blows smoke.
Took cylinder 2 head off again as it is now my hunch that it is the problem - has some oil in it.
So that's where I'm at. Need to find:
1. Cause of the crack sound, like metal snapping
2. Why won't start (without fuel down carby)
3. Clouds of smoke when I do start it
Any clues would be very helpful.
Thanks, Mark
I have a Cub Cadet LT1046 with a 23hp CV23S Kohler commander V-twin (Spec # 75604)
A couple of weeks ago I almost finished mowing my lower back yard, about 1.5 acres, when it suddenly stopped. After some trying it started again, but blew clouds of light blue smoke.
It also made a cracking noise, like something cracked/broke. Shut it down quick.
What I found/did so far:
Spark plugs look oily. Cleaned the plugs, I get a blue spark when I test them. It fires fine with fuel down the carby, so I assume spark is ok, at least short term.
Checked fuel line, pump & solenoid fuel to carby OK (actually now I think about it when removed solenoid, fuel runs out, so fuel getting through). Thoroughly cleaned carby - jets, float and all look ok.
Borrowed a compression tester and it tested at 165 and 175 psi - manual states 165 psi.
I did a bit of a DIY leakdown test using compressor. The only noticeable air is when I put my finger over the breather - after a short while I release it and some pressure has built up.
I put fuel down the carby again and it fires up for a few seconds, then stops. Blows a lot of blue smoke.
Someone suggested head gasket. Heads off - old head gaskets, reed valves look OK.
I tried with new gaskets first on 1, then on 2. It does not run for more than a few seconds with the new gaskets. Still blows smoke.
Took cylinder 2 head off again as it is now my hunch that it is the problem - has some oil in it.
So that's where I'm at. Need to find:
1. Cause of the crack sound, like metal snapping
2. Why won't start (without fuel down carby)
3. Clouds of smoke when I do start it
Any clues would be very helpful.
Thanks, Mark
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