Injector trouble

[DieselPower]

Umm, is that a typo error or is the compression really 200/200/400? If it's not a typo that is probably your problem. If it is correct then the two cylinders with 200 PSI are more than likely your problem. Cracked head or blown head gasket would be the likely culprit's.

 

[DennisStahley]

Umm, is that a typo error or is the compression really 200/200/400? If it's not a typo that is probably your problem. If it is correct then the two cylinders with 200 PSI are more than likely your problem. Cracked head or blown head gasket would be the likely culprit's.

Ok so ya think its the cyl.? Yes that is the correct readings but others on here said if it ran it should be ok? But I guess if the compression is that low maybe it can't start on its own? It ran great when it started for about 20 min. and then faltered, but no smoke of any kind, neither white,black,or blue smoke. The Kubota dealer said it might be the head gasket also between the 2 cyl. thats why it might have low comp. on them? I guess my next step should be to take off head and check for a blowen head gasket, never done this before on a diesel. Is there any way to check without tearing it down to see if it is the head gasket? Any input will be gladely taken.

Dennis

 

[gemini5362]

I am not a diesel mechanic and there are others here but could he not take another compression tester ( borrow one from a parts store) put them in take compression readings from both and see if they equalize out after a few minutes. Not sure if you can get all valves closed at the same time or not but if you can should see pressure in one cylinder go down while the other goes up

 

[john_bud]

With the injectors out, you can buy or make an adaptor that allows you to use compressed air to pressurize each of the bad cylinders. Do that when at TDC on the compression stroke. Do it in a quiet place. Listen for the whistle of escaping air. If it's in the other 200 psi cylinder - they are leaking together. Either head gasket or a crack.

Other places to observe are the intake manifold, exhaust manifold, oil galleries and radiator.

You want NONE in the adjacent cylinders (cracks or blown HG), radiator and manifolds (leaking valves) and as little as possible from the oil galleries (blow by past the rings).

 

[RichNJKubota]

I don't have much experience with diesel engine diagnosis but 200psi sounds a bit low to me.

 

[DennisStahley]

With the injectors out, you can buy or make an adaptor that allows you to use compressed air to pressurize each of the bad cylinders. Do that when at TDC on the compression stroke. Do it in a quiet place. Listen for the whistle of escaping air. If it's in the other 200 psi cylinder - they are leaking together. Either head gasket or a crack.

Other places to observe are the intake manifold, exhaust manifold, oil galleries and radiator.

You want NONE in the adjacent cylinders (cracks or blown HG), radiator and manifolds (leaking valves) and as little as possible from the oil galleries (blow by past the rings).

Hi.
Thanks for the tip I will try this and see if I can hear any air leaking. As for blow by it is not smoking a bit, any color at all. When first started it blew black smoke but it hasent run in 3 years but it quit blowing the black smoke about 15 sec. after it started.

 

[DennisStahley]

I don't have much experience with diesel engine diagnosis but 200psi sounds a bit low to me.

Hi.

Yes I thought 200 psi was low also but some of the guys on here said that was fine? And they said if it started and ran it must be ok? I don't know if that is why it won't start by itself with out the help of starting fluid? Which I know you are not suposta use to start it.

 

[BTDT]

Pull valve cover and see if valves are adjusted correctly. My stepdad called this week and said our tractor didn't have any power. I went to see, it was hard to start (actually wouldn't start). I pulled valve cover and one of the pushrods had come out from under rocker arm. I put back and adjusted valves, started right up.

 

[DennisStahley]

Pull valve cover and see if valves are adjusted correctly. My stepdad called this week and said our tractor didn't have any power. I went to see, it was hard to start (actually wouldn't start). I pulled valve cover and one of the pushrods had come out from under rocker arm. I put back and adjusted valves, started right up.

Hi
Well I will check this out and see what I find, thanks for the tip