Frank Stein

i have 928 . Replacing water pump . Short of it. Long story. I bought it for my mother and it dumped coolant 1 month after we got it. Sitting in driveway just unloaded it so it sat . Now im having it fixed and we run into few questions... there seems to be belt tension pully. Idler pulley and another small wheel near bottom that i have no idea what its for but bearings seem rough. I need to order these parts but dont know terminology for those parts . But main question is .. when replacing water pump and timing belt ... what else should be replaced so as not to have to crack this back open for the next 60k?

Billu

Your best bet would be to call Roger at 928rus. He can give you options.
I personally would get the PK tensioner, which does away with a couple of the pulleys and eliminates rebuilding the stock tensioner and eliminates the need to check and adjust the belt tension later.
The small pulley below the crank is , I think, a belt retention device and doesn’t move under normal situations.
Also, long term, make sure you get a water pump with a plastic impeller. The mental ones can come loose and damage the block.

worf928

You need this:

https://members.rennlist.com/pirtle/tbelt.html

mkhargrove

front main crankshaft seal.....

mkhargrove

btw.....the water pump/timing belt job is not as difficult as you might think....my only suggestion is to get a piece of cardboard to press the water pump bolts into it in more or less the layout that they are in on the vehicle so that you don't mix the up....they are different sizes. if i remember correctly, you'll probably end up taking off a lot of bolts from power steering pump and alternator, etc. tag them. and take plenty of pics.

oh, don't forget to have a pan ready to catch oil when you loosen the oil return tube from the top of the oil pan in front of the engine.

FredR

First of all it is always prudent to introduce yourself and to tell us a bit about your 928 and post a few pics- not manadatory but always appreciated. To better help you we ned as a minimum to know what model year and mileage. Your location can also attract the attention of other owners with knowledge who might be just around the corner from you [not me though!].

Regarding the small pulley- that exists to stop the timing belt jumping off the pulley in the event of a backfire rare as such may be. The classic items to be wary of in the timing belt system are the sprockets, the belt tensioner, the pulley wheels/bearings and the rotor arms/distributor caps. All are wear items that go with a mixture of age and use and easy to refresh/replace when changing the timing belt. Knowing when they need replacement is another matter.

Frank Stein

Thank you everyone for your suggestions. It was noted by one person i should tell you about car. Smart . Not enough information in my post. It is a 84 bought from little old lady in los Angeles. I had it shipped out here to Alabama as a gift for my mom because she likes them . Its black on black. Only 80k. Garage kept . But sat for a long time b4 we got it. Than her son had it fixed sold it to us and thats when it broke in our driveway.we only had it for 1 month . Than it sat for another year because my mom loved driving my dually. Now we moved to big city of mobile al. And i dont want her driving my large truck on narrow streets. Hence... the fix .

worf928

So... given that your thread title starts with “newbie” and you write “dumped coolant 1 month after we got it. Sitting in driveway just unloaded it ...”, I need to ask: why are you certain that the coolant leak is the water pump? Why? Because my visual is a giant puddle of coolant under the car and that’s not a pump failure mode.

Frank Stein

I heard noise from it night b4 . Center front of engine . Thoght wonder what that is. Walked out door next morning and with perfect timing just as we shut door all the fluid started pouring. Opened hood . Coming from center and there you have it reason of deduction. Note. This is my first porsche. Even though i don't work on cars anymore ( broken back) i am a good car person i have built many amx's a pontiac lemans, a gran torino, 2 pickups, a dodge demon, and a couple of AMC jeeps, and 2 kaiser jeepsters. So ive been around the block.

Frank Stein

thx called roger hes a great guy offered all kinds of help.

worf928

Ok. Make sense even though that's a very uncommon mode for the 928's pump. Usually they start leaking with a trickle not a deluge. Whereas hoses on the other hand...

A big problem with 'old' 928s is that they spent a lot of time just sitting in a garage with their owners not realizing that a car sitting doesn't mean it is in stasis and that fluids and seals and rubber hoses still age.

Maybe your pump is just so old that it didn't have any life left at all. You'll know when you get it out.

Fair enough and good to know. It's often hard to get a measure of acumen with new folk's first 10s of posts.

Daniel5691

Welcome Frank.

Wisconsin Joe

Welcome. I would suggest reading through the 'New Visitor' sticky at the top. Chock full of useful info. One thing is link to a free down load of the Work Shop Manual (WSM). Roger has a better one available on CD-ROM, but it's not free.

Also in there is a link to "Dwayne's Workshop", a very well done collection of 'how to' write ups. There's a really good one on the "Timing Belt/Water Pump" job (TB/WP). But it's for a later car, with the 32v motor. Your 84 has the earlier 16v motor.

While there are tons of similarities, the 16v is a bit different.

There's a really good write up here:

https://rennlist.com/forums/928-foru...with-pics.html

There's a fair amount of stuff that should be done on a TB/WP. The tensioner should be rebuilt (or replaced with a PorKen tensioner). Oil pump seals, oil pump gear (probably), Cam gears (maybe), crank seal (maybe), cam seals (maybe), more that I can't think of off the top of my head.
If you go through both write ups, you will get a good idea of what you are getting into.

Given what you said you've worked on, it shouldn't be too much for you. It's just 'parts bolted to parts'. Really freaking expensive parts, but still just parts.

Some of them may have been on a long, long time, so standard 'potentially stuck bolt' procedures should be followed.

Good luck, keep us posted, and put up a couple pics of the car. Maybe one of your mom with it, since it's her car (not trying to be creepy).