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I just did a compression check on my c5500 service truck and…

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I just did a compression...
I just did a compression check on my c5500 service truck and found #8 cly is 120lb low need to pull valve cover do I unbolt cac and try to raise to get room or do I have to pull motor???? Jack
Submitted: 2 years ago.Category: Chevy
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Answered in 2 hours by:
1/21/2016
Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago
wtolkson
wtolkson, ASE Certified Technician
Category: Chevy
Satisfied Customers: 11,325
Experience: worked on Chevy for 30 + years
Verified

Hi I'm Wayne

I will help you with this

No you need not pull the engine

but what is cac

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Customer reply replied 2 years ago
was going on a 4 hour trip when engine starting to run bad making a clinging nose like a rocker arm. white fuel smoke out exhaust. pulled back to shop pulled #2 wire off injector smoke stop but still had noise, done gm wire up grad on #2 and#8
still had noise, pull all 8 glow plugs all had 400lbs except #8 at 300lbs. this is a chev. C5500 durmax no room to get injector or valve cover off can cab be jack up on one side? or what else do we do. Thanks Jack
Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago

Hi Jack

Thank you for that

With this hew info , it might be to your advantage to pull the engine,

Reason I say this is I believe that you may have a valve issue

on #8, may have to pull the head, and hard to do in truck

So I suggest pull the engine

I hope this helped you

Hi if this helped you

Please rate my answer 3 or more stars

If you need more info, use request button

Not Poor/Bad service

Wayne

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Customer reply replied 2 years ago
you cannot get cab high enough to pull head if needed???
Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago

Hi

yes you can

but know you are work high up and reaching down

will be hard on your back

Wayne

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Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago

Hi I'm Wayne

Just following up with you

witch direction did you decide to go

Let me know if my answer help you

Not Poor/bad service, use request

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Customer reply replied 2 years ago
raised cab and got top cover off to check lifters and push rods see no problem???? drain oil don't see any thing in it what know?? with sound coming out it was like a rocker arm or push rod,??
Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago

Morning

Well them you have a piston issue on that cylinder

sounds as a the skirt on the piston may have broke

or wrist pin came loose, putting a score mark in the cylinder

Hi if this helped you

Please rate my answer 3 or more stars

If you need more info, use request button

Not Poor/Bad service

Wayne

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Chevy Mechanic: wtolkson, ASE Certified Technician replied 2 years ago

Hi

Just following up with you

did my answer help you

let me know ,Please

Wayne

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