dcrasta

Compared to internal engine repair Oil changes and coolant flushes are cheap. I have links to youtube video's of engines that have been neglected by lack of frequent oil and coolant changes.

Antifreeze contains chemicals that inhibit corrosion and scale formation in the engine and radiator. Age degrades the effectiveness of the additives and over time can cause the formation of corrusion and scale buildup in the passages and radiator. THis can lead to premature failure of the water pump and degraded performance of the radiator and/or cooling passages in the head and block. Also this can lead to deterioration of the Head gasket (the 928 has a 'wet' cylinder liner. Cooling system neglect is the leading cause of premature engine failure and Ethylene glycol is a petrochemical product. All Petrochemical products degrade over time. This is why gasoline 'goes bad', Oil oxidizes, absorbs moisture, gets contaminated with combustion byproducts, destabilized by exposure to heat (thermal breakdown), etc.

Considering these cars are high performance aluminum block/head designs, I would not compare this motor to your fathers oldsmobile.

The differences in operating temps alone (with the more modern 928 engine adding thermal stress to the coolant and oil systems that the older v8s never reached) require better lubrication and temp control across a wider operating range (Rpm).

Best to follow the Factory recommendations, and that typically calls for frequent oil changes (5~10k miles depending on environment and driving conditions) and coolant replacement every year or so.

My water pump and bearings are too expensive to gamble with. YMMV.

sharkbite84s

Hey viper,

Wow this sounds familiar. I have an 84 S2 Euro 5 speed that I have owned since 1986. It was only driven occasionally after 1992 and has been parked under a cover in my garage since 1999 which is the last time it would start. About three weeks ago, I decided to get it back on the road. BTW, I live in Bethesda.

Check out Dwayne's excellent thread about removing your gas tank. https://rennlist.com/forums/928-foru...re-w-pics.html

That should be the first thing you do. My fuel pump was trashed, not sure when, but the screen was bad and the gunk in the gas would have done it this time if it was not already gone. I found an unbelievable amount of crud from the old gas gumming up the return line / level sender, the baffle in the bottom of the tank, etc. I took the tank out and cleaned it out with Berryman B12 and it is all clean now. Waiting on parts to put it back together.

Now I am on the electrical system. Doing the grounds and chasing bad relays. Just getting going on this, but so far I can't get any sign of spark, but am hoping/expecting a few new relays and clean grounds, plugs, fuses, etc. will do the trick. Then it will be on to the next thing. Fortunately it has been sitting with clean Mobil 1 in it so the engine turns nice and smooth. I am just hoping my LH and ignition controllers are OK as they are pretty expensive pieces. I had bought the factory service manuals back in the 1980's so that helps a bunch.

I think if you start with the fuel and do all of the fluids, and electrical suggestions and take it slow you can get yours running. Don't replace all of the things that might be bad, focus on what is bad. Once it is running you can do the other things. I am expecting this to take me a while since I still have kids sports going on etc. etc. The good thing is they are encouraging me to get it going. I guess it is an image thing.

Good luck with your car.

Terry

brutus

The 84 Euro 16 valve PROBABLY will not bend valves if the long overdo T-belt jumps time. The 32 valve engine 99.99 % of the time will bend most if not all the valves ! Major difference. But fuel issues, corrosion from old coolant and brake system corrosion are much the same.
But get them running and enjoy your cars !!

Hilton

That depends on the engine number - early '84 Euro's used the same pistons as the 80-83 928S (4.7L k-jet), which are non-interference.

Partway during the 84 model year, the piston design was changed to the S2 high compression version - still a 4.7L engine, but yielding 10.4:1 compression.

There's a good thread somewhere here on the differences and it references the changeover point.

edit: found it.. here's the info for Terry just above with the Euro S2.

Note the two engine number cutoffs - one is for auto's, one for manuals. Terry - if your engine number is under that range, in your shoes, I'd just deal with getting the car started first. If above definitely do the timing belt before trying to start

sharkbite84s

Hilton,
Thank you for the info. Mine is a 10:1 car using your post. Also I had cam belt in just before parking it.
Terry

Vipermn1

Thanks. Car is being worked on now, all the basics as you mentioned are being done and then once running i'll get to whatever else is necessary. Can't wait to hear it running again.

IcemanG17

Gotta ask....why did you park it in the 1st place? The standard answer is something expensive needed repair so it was parked.....

Vipermn1

I mentioned earlier that there was nothing wrong with the vehicle when i parked it. My son's grew up playing very competitive baseball and i coached their teams and to top that off i travel a ton for work. Still no excuse for letting it sit but i have three other cars that i drive two Mercedes and an Acura MDX. Just want to get it up and running and have some fun with it now that my boys are older.

Vipermn1

Just heard from my guy and my car is running!! No knocking, no oil blowing out the back, running smooth. Did just enough to fire it up to make sure no crazy issues. Still much to do on it from a preventative maintenance stand point but's running! Did need a fuel pump and filter just to get it fired up. Still need to replace the plugs, wires, fluids, etc.

brutus

And you NEED to have the rubber timing belt changed ! But good that it is running,if it were my car I would NOT turn the key again until it had a new belt but I would not have turned the key at all. You rolled the dice and won ! Please do not keep throwing the dice, because the odds are not in your favor.

Vipermn1

Brutus thanks! Timing belt being installed tomorrow as well as the rest of the necessary maintenance. By the way how can i add a picture?

BC

Www.photobucket.com

Vipermn1

Thanks! I'll add pic's of my car car soon.

Vipermn1

Vipermn1