kriz2ooo

Hey guys, I just bought a 2001 Ford f150 crew cab lariat, 4x4, with the triton v8. The truck has 77,000 miles, I'm worried about the head gasket problem, here are the compression numbers...

Cylinder PSI
1 148
2 145
3 140
4 143
5 139
6 144
7 145
8 145

What do you think? Could this be the head gasket? Also what spark plugs should I use?

Thanks

Just call me Sean

iTrader: (1)

Those look like good numbers to me.

cole_ford

Agreed, numbers look fine. As far as plugs, I would go with motorcraft.

kriz2ooo

thanks, I was worried

Lenn

You just gun-shy or is it giving you a reason to question it?

kriz2ooo

my boss thought it was blown

iowaredneck

If it runs good then I think you should be fine. Numbers are good, just use motorcraft parts for plugs and wires and you should be fine.

Good old Bill

Your Bosses point of view has merrit. His thinking is the numbers so close together on 6-7-8. Unless this thing runs absolutely horrible believe the numbers are good and not any leakage between cylinders. Its really nice to see numbers with in 10% of each other. If there is still a question, suggest doing a leak down check. That will eliminate the head gasket question. Sure hope you are on good terms with the Boss, questioning his judgement is risky.

kriz2ooo

yeah, he is alright with it though, what is involved in a leak down check?

Good old Bill

Spark plugs removed, air is applied through the plug hole and a second gauge will read what pressure doesn't leak out. The advantage of the leak down test is you can tell where the leakage is. The intake valve, the exhaust valve or into the crankcase past the rings. If air is put into #7 and comes out #8 plug hole the gasket is bad.