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After I replaced the head gasket and now the car won't

Customer Question
start...
After I replaced the head gasket and now the car won't start
Submitted: 1 year ago.Category: GMC
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Answered in 41 minutes by:
6/6/2016
GMC Mechanic: Matt, Engineer replied 1 year ago
Matt
Matt, Engineer
Category: GMC
Satisfied Customers: 22,168
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hi

can you tell me the make, model , year and engine size of the vehicle please ?

also have you tried doing a compression test across all cylinders ? as they should all be within 10-15 psi of each other

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Customer reply replied 1 year ago
2003 Izusu npr hd 4.8l diesel
Customer reply replied 1 year ago
Good compression
GMC Mechanic: Matt, Engineer replied 1 year ago

Hello

Ok in that case I'd ask are all the compression figures very close to each other as if you have a couple of low figures then this would indicate the cam timing is out - which can then be the issue of not starting

it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.

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Customer reply replied 1 year ago
This truck was running perfect just because mixing oil and antifreeze, we decided to replace the head gasket, the radiator and the reservoir.
I missed the marks then I broke three rockers
My question is how do I set up the marks?
Do I need remove the head again?
How do I get a tdc?
I'm not a diesel mechanic anymore
GMC Mechanic: Matt, Engineer replied 1 year ago

OK

I don't have the timing data for this engine so I'll opt out and open it back up to others

good luck

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GMC Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 23,265
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer!

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sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 23,265
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