? on compression check
#2
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I dont believe Cummins gives a specification for compression values. There method of checking for loss of compression is checking for excessive blowby. With so little miles, can I ask why a compression test is being run?
#3
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I think that my head gasket is blown between 2 cylinders. I'm getting a poping from the intake and from the exhaust. The engine also has very little power.
Thanks Cris
Thanks Cris
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Heres the compression #s 3 tests were done on each cylinder for 5 seconds each.
#1 480lbs 485lbs 475lbs
#2 475lbs 490lbs 490lbs
#3 520lbs 530lbs 535lbs
#4 520lbs 510lbs 520lbs
#5 530lbs 540lbs 520lbs
#6 515lbs 515lbs 510lbs
I just can't figure what is causing the poping and the loss of power in my engine
CRIS
#1 480lbs 485lbs 475lbs
#2 475lbs 490lbs 490lbs
#3 520lbs 530lbs 535lbs
#4 520lbs 510lbs 520lbs
#5 530lbs 540lbs 520lbs
#6 515lbs 515lbs 510lbs
I just can't figure what is causing the poping and the loss of power in my engine
CRIS
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#8
Have you checked low side fuel pressure, rail pressure? Rail relief valve?
Popping under hard throttle is usually a good sign the rail is draining or pressure dropping?
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The truck is poping through the exhaust at idle
We checked the pressures with the injectors out and with them in.
As for timing I don't have a clue A great and trusted friend of mine said that the cam may be bad, so I'll have the check the lift on all the push rods.
We also checked #1 + #2 cylinders with air pressure, but nothing was coming through the valves just past the rings.
This problem is stumping me, the dealer said that they can't find anything wrong I know that there is something wrong because of the poping and the fact that the truck is a SLUG.
I really think that the gasket is blown between 2 of the cylinders, but I have no way to prove it without pulling the head.
Thanks for all your help
CRIS
We checked the pressures with the injectors out and with them in.
As for timing I don't have a clue A great and trusted friend of mine said that the cam may be bad, so I'll have the check the lift on all the push rods.
We also checked #1 + #2 cylinders with air pressure, but nothing was coming through the valves just past the rings.
This problem is stumping me, the dealer said that they can't find anything wrong I know that there is something wrong because of the poping and the fact that the truck is a SLUG.
I really think that the gasket is blown between 2 of the cylinders, but I have no way to prove it without pulling the head.
Thanks for all your help
CRIS
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if its blown between two cylinders then if you have the injectors all out you will hear/feel air coming from the cylinder that it is blown across to from the injector hole. you may want to try a leak down tester also.
#12
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One of out trucks at work has a NTC 400b/c, it was running away, smoking, and no power, I checked the exhaust manifold with my heat gun but reading were chaotic across the board, so I pulled the exhaust mainfold/turbo plugged the oil feed line and started the engine. #2 cyl not fireing at all, fuel return to tank was charging tank with compression, found a broken injector hold down bolt which in turn took the injector, injector cup, and head with it. Moral to the story, the engine ran horrible without a defined skip, it was popping and sputtering, with no power all because of the compression gasses interference with the fuel supply.
Good luck,
Tim
Good luck,
Tim
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