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TOPIC: Head gasket and other works

Head gasket and other works 13 Apr 2016 10:52 #18946


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  • snizinskas's Avatar
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Hi,

I have recently acquired 1988 928 S4 with a blown head gasket with 180k miles on the clock.
I am currently preparing a to-do and shopping list.

On the to-do list the plan includes pulling out the motor, taking off the heads, sending them to motor specialist to inspect as well as do works on valves, etc.
At the same time I wish to replace the timing belt and idlers/rollers, to service the tensioner, replace the water pump.
While putting the motor back I plan to replace motor mounts.

My current shopping list includes:
Tensioner service kit
Timing belt, idler and main roller
Water pump
Cylinder Head gasket set
Volvo motor mounts

Obviously there must be people who went through what I am going through now; therefore, I would appreciate your advice of what other servicing should I perform while the engine is out.

Many thanks,
Saul
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Head gasket and other works 14 Apr 2016 23:27 #18947


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Hi Saul,

My 31-year history with the 928, sequentially owning a '79, '84 S, '88 S4 and now a '94 GTS, leads me to the conclusion that once you have your car down for service youshould cleanup and/ or replace everything that your wallet can afford. :cheer: This may save you further down time in the near future. You want to spend more time enjoying the driving experience rather than having it in the garage up on jack stands, right?
The things that I replace when doing the water pump and t-belt are the upper and lower radiator hoses, ac, alternator and power steering belts. This may also be a good time to replace the thermostat and make sure the radiator is clean. I opted to upgrade to the PK Tensioner setup on my GTS. And since you have the heads off already, you may as well replace all of the vacuum hoses that run underneath the intake manifold. I also replaced the knock sensors and the crank position sensor. While I had the engine up replacing the motor mounts with the solid rubber style, I took the opportunity to pull the oil pan and replaced the gasket with a silicon gasket which required upgrading to the oil pan stud kit (to compensate for the extra thickness of the gasket). I also took the opportunity to relieve the flex plate tension. Finished off with fresh fluids and filters.
Personally, I'm the guy who doesn't mind mind working on cars, but I can't stand repeating the same job over if you know what I mean.

Good luck with the job!

-Kevin Usher
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Head gasket and other works 15 Apr 2016 02:37 #18948


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Many thanks Kevin for the advice! Much appreciated
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Head gasket and other works 17 Apr 2016 14:46 #18950


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For 32 valve motors the cam chain tensioner/chain system (different from cam belt tensioners) is not listed as a service item so there isn't a set mile number for inspection and change. It is a good idea to inspect and replace them around the 120K - 150K mile mark. If anyone is interested, I have a PDF document that provides an overview ... drop me a line at This email address is being protected from spambots. You need JavaScript enabled to view it. and I'll email it to you.
Rich
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1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast
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