1997 Volvo 850 • 5 cylinder 2WD Automatic •

1997 Volvo 850 5 cylinder
If the head gasket blows and I have it replaced, could there be warped damage to the area around it? Also, could it cause the head bolts to need to be replaced? What is the most common cause of a busted head gasket if the car is not overheating? If the odometer is broken, could the same electrical disruption be causing my temperature gauge to malfunction?
February 7, 2011.

Yes your guage could not be working right however they normally work or they don't. But overheat is not the only thing that causes head gasket failures. Some times just age or the weather in your area some gaskets just fail. There is a lot of pressure between head and engine a weak spot will surely eventually blow the gasket.

Warpage is definately a possibility some are some aren't. But most technicians will choose to have head machined because they have to guarantee the job and milling the head is just another way of trying to be sure it does not happen again.

Head bolts replaced. This is a required because you have a aluminum head the bolts are stretch to yield bolts. These bolts actually stretch as they are torqued put a new beside a old one and you will see how far they have to stretch. The only way to get the required torque is these special bolts. Hope this helps

Feb 7, 2011.
Absolutely. Thank you very much. Could you maybe explain the timing belt/chain to me? I know what happens when it breaks, but my mechanic suggested replacing it while he was taking care of the head gasket. It's never been replaced, so I know I need to get it replaced, but how are they correlated?

Feb 7, 2011.
Yrs the timeing belt is the life line of the whole engine. This belt connects to the engine and the cylinder head it turns the cams which operate the valves at a precision level as to keep valves from opening at the wrong time and hitting the pistons. This belt has a very hard job there is a lot of torque on this belt. If this belt breaks you coulf be doing the exact same repair that you are now except the added expence of 1000 dollars worth of valves.

So your mech is reccomending everything that any good tech would he is trying to make sure you don't have to do this again.

Feb 8, 2011.