ried

Gents,

I've got a new 1988 928 S4 and have some questions on what the initial "must do" items are for a stock vehicle with unknown service history. Coming from the 944/951 world, I realize these cars share many components, procedures and issues. Here's my starter list:

1) Timing belt and water pump.
2) Engine mounts.
3) Fluids and filters. Oil + filter, transmission fluid, fuel filter, brake fluid, power steering fluid.

Any other "must do" items on the 928? Other 928-specific questions:

I know that the community has developed the PorKensioner as an updated solution. Should I be installing that during the timing belt and water pump replacement?

944s with 16-valve heads need their timing chain tensioner pads replaced after 100K+ miles and 25+ years. Does the 928 need its upper and lower timing chain pads replaced on a similar schedule?

Is Mobil 1 20W-50 V-twin engine oil also appropriate in these cars?

What's the recommended automatic transmission fluid?

The 928 is new for me, and I realize that not all of my experience with the 944/951 will translate directly. Advice would be greatly appreciated.

Thank you all.

ried

Also, here are the codes shown on the options sticker:

C02 U.S. emissions
M139 Seat Heating System, Left Seat
M220 Locking Differential - 40% (87-89)
M302 Type designated on rear end
M340 Seat Heating System, Right Seat
M347 Forged Wheels Platinum Anodized, Rim 7 x16 , Tire 225/50VR-16
M418 Side Protection Moldings
M494 Additional Amplifier
M533 Anti-Theft Device
M570 Air Conditioner with Improved Efficiency (Rear A/C)
M586 Back-Support - Left Seat
M650 Electrical Sliding Roof
M691 CD Player "CD-2" with Radio

ammonman

Take a look at the New Visitor sticky at the top of the page. Most of your questions will be answered.

Mike

ried

Thanks Mike, greatly appreciated. Sorry for jumping in without the proper prep!

GT6ixer

Failure of old soft fuel lines and PS lines have been the cause of many fires. They are now consider mandatory change items if you have no records of prior maintenance. Contact Roger at 928sRus and he can help you with what you'll need.

Oh and post some pics of your new ride!

ammonman

No worries. The sticky just saves lots of typing for you and whoever tries to answer your question(s).

Mike

ried

Thank you, sir. Same issue with 944/951s. It goes on the list!

GregBBRD

Relax the fkexplate.

Check the crankshaft endplay

Install a stronger clamp.

jcorenman

Congratulations, and welcome! There is a pretty active PacNW email group, search Yahoo groups for "PacNW928". You just missed a great get-together.

What's the history of the car? How many miles, where did it spend its life, what's the general condition? Any idea when the TB/WP was last done?

Pull one of the intake tubes, start the engine and peer down the vent with a flashlight: What you are looking at is the backside of the timing belt. Do you see a flash of white a couple times a second? That's the lettering on the backside, if you see it then the belt is relatively new, if not then it means nothing-- it disappears long before the belt is worn and aged.

Motor mounts are lower priority, they may contribute noise/vibration but won't wreck the engine or burn anything up.

Fuel lines, as noted, are a high priority. At least find them all and check carefully for cracks and flexibility. There are four under the hood if I recall correctly. The ones back at the fuel tank don't see high temps and fare better, and don't leak into the exhaust. But the auto-tranny oil-cooler lines will leak onto the cats, so check those also.

Search here for oil threads, but only when you have a lot of time and plenty of beer at hand. 20w50 is correct and V-twin is probably OK and but borderline too much zinc (1600 ppm). Many folks here use Brad Penn, and that is my current favorite-- partial synthetic so plan on 3-4K mile changes.

PK tensioner versus stock is another theological issue, bottom line is that both work but priorities differ. I've got the factory tension gauge if you want to throw a TB/WP party (with the obligatory pizza/beer of course).

Timing chain pads: If the car is over 100K miles and you are in there for some other reason then change them, but don't dive in for that alone.

saltwaterdragon

I bought an 88S4 a few months back and am also going thru various items...one of the constant problems appears to be various items with the electrical system...you may want to systematically check all the ground points you can easily access...there is reference material on this and maybe one of the more knowledgeable guys can get you the links...

dr bob

My new-purchase budget recommendation is for replacement of pretty much every rubber piece on the car, less a few body gaskets. Based solely on age, compounded by mileage and heat, there isn't much in the way of rubber on the car that's worth the risk. IMO anyway.

Welcome to the group! Invest in Rennlist membership, and you'll have lots of benefits like a signature line to list your car's year and details. PNW has a great local support network going on, take advantage of all that local knowledge too.