986 2.5 Engine Rebuild Advise

[Matt1984]

Hi all I’m new to the club and new to Porsche ownership having 2 weeks ago bought a 1997 986 2.5.

I bought the car from auction as a main dealer part exchange and as such knew it would require some work, unfortunately there were a couple of exhaust blows so we thought it would be easy to just whip the exhaust off and repair it on the bench. Sadly 10 of the 12 manifold bolts snapped in the head and we were unable to drill them out.

I’ve dropped the engine out to get the heads off to get the bolts drilled out. Whilst the engine is out I will replace the IMS bearing and think that as the car has covered 100,000 miles I should replace the chains and tensioners.

Is there anything else I should replace whilst the engine is out and apart (other than gaskets)? If I’ve gone as far as to have the engine out and on the bench I’d rather do everything I should in one go.

Also where is the best place to go to for a new IMS kit and the chains?

Any help would be much appreciated.

Thanks

 

[russtbird]

Hi and congrats on your purchase!
It often is the case that one little job leads to a few more big ones!
You should consider replacing the clutch friction plate/cover whilst its apart.
Regarding the IMS bearing choice there are 4 or 5 options across a wide range of costs. I've looked into this as a potential future project and found YouTube helpful; however, there are a lot of very good posts and more than as many bad ones on the subject! IMHO it would be worth looking at these two links to give you an idea of the replacement IMSB options available:
Porsche Club of America:
https://www.youtube.com/watch?v=I0dqyvvf8uw
Burners Cars:
https://www.youtube.com/watch?v=IxdvSq_byZw

Good luck!

 

[Matt1984]

Hi and congrats on your purchase!
It often is the case that one little job leads to a few more big ones!
You should consider replacing the clutch friction plate/cover whilst its apart.
Regarding the IMS bearing choice there are 4 or 5 options across a wide range of costs. I've looked into this as a potential future project and found YouTube helpful; however, there are a lot of very good posts and more than as many bad ones on the subject! IMHO it would be worth looking at these two links to give you an idea of the replacement IMSB options available:
Porsche Club of America:
https://www.youtube.com/watch?v=I0dqyvvf8uw
Burners Cars:
https://www.youtube.com/watch?v=IxdvSq_byZw

Good luck!


Thanks for the reply.

I’ll have a look at the links.

Im sure this is going to be a very interesting learning curve!

 

[Motorhead]

Matt,

I’d agree with Russ that it will be worth checking the flywheel and clutch condition while you’re replacing the IMS bearing and rear main seal. You might want to check out your local Porsche dealership for parts … don’t forget the 10% discount you get with Club membership.

Did you do compression and leakage tests before removing the engine to check the bore and valve seating conditions? Having said that I suppose with the heads off you should be able to have a good look at both.

Having the engine and transmission out of the car will give you a chance to check the driveshaft CVs and it may be worthwhile checking the gearshift cables for wear at the actuators. With 100k miles on the clock I’d replace the engine and transmission mounts.

Keep us posted on progress, and good luck!

Jeff

 

[Matt1984]

Thanks for the reply.
I will replace the rear main oil seal, clutch and flywheel as routine.

I didn’t carry out a compression test stupidly before I removed the engine although I did mean too. The engine did run well for the whole 55 miles I did in it.

Thanks for mentioning the mounts as I noticed a rear 1 was leaking and I’d forgot to ad it to the list!

As you said with that sort of mileage I will replace the gear cables too, I think I would be mad not too as it would be a far easier job to do now that with the engine back in!

I assume that I just have to give my membership number for the 10% dealer discount?

Thanks

Matt

 

[Motorhead]

Yes, just give them your membership number or take your card along if you’re going to the Centre. They’re usually quite price-competitive with the discount, but it would be worth checking other Porsche parts specialists for a comparison. Apart from the usual suspects (Design911 or Porscheshop can be a bit expensive) you could also try Type911 https://type911shop.co.uk/

Jeff