Top EndRebuild

[snowman]

First of all I would only remove a single rod. Inspect the bearing and if it is not to worn, ie oil clearence is withing Porsche spec. I would buy two rod bolts and nuts and carfully put the rod back on and leave the rest alone. As to the rings. check the side clearence to the specs. If its just in spec or at spec I might replace the rings and go with it. I might even go with a thou over spec in the going it cheep case. If you do replace the rings, it is very important to use a grape hone (ball hone) to clean up the cylinder. Forget all other types of hones for this operation. Use about 20 passes with plenty of transmission fluid for lube, ie a quart per cylinder. You can buy this type of hone for about $50 from your local auto parts dealer. Don't forget to check the cylinder wear. It must be round and withing spec, if not don't waste time reusing it. the only hope here would be slightly bigger pistons with the cylinders rehoned to the correct size ( thats only if they are cast iron and not fancy cylinders. otherwise they may need recoating or whatever, not cheep. but possible)

What you are proposing is not really realistic. I know how you feel but one of these engines is not a poor mans transportation, like a chevy. There is a point where the bucks need to be spent to get back a real performance engine (which ALL Porsches are) Thats about 125,000 miles and EVERYTHING needs to be done PROPERLY if you still want to have a REAL Prosche when you are done.

[HarryD]

Originally posted by snowman
First of all I would only remove a single rod. Inspect the bearing and if it is not to worn, ie oil clearence is withing Porsche spec. I would buy two rod bolts and nuts and carfully put the rod back on and leave the rest alone. As to the rings. check the side clearence to the specs. If its just in spec or at spec I might replace the rings and go with it. I might even go with a thou over spec in the going it cheep case. If you do replace the rings, it is very important to use a grape hone (ball hone) to clean up the cylinder. Forget all other types of hones for this operation. Use about 20 passes with plenty of transmission fluid for lube, ie a quart per cylinder. You can buy this type of hone for about $50 from your local auto parts dealer. Don't forget to check the cylinder wear. It must be round and withing spec, if not don't waste time reusing it. the only hope here would be slightly bigger pistons with the cylinders rehoned to the correct size ( thats only if they are cast iron and not fancy cylinders. otherwise they may need recoating or whatever, not cheep. but possible)

What you are proposing is not really realistic. I know how you feel but one of these engines is not a poor mans transportation, like a chevy. There is a point where the bucks need to be spent to get back a real performance engine (which ALL Porsches are) Thats about 125,000 miles and EVERYTHING needs to be done PROPERLY if you still want to have a REAL Prosche when you are done.

Snowman,

In many ways you are correct, but my mission is bit more limited.

If I can get another 20-30k before complete teardown, for me, it is money well spent on life extention.

Will it cost more in the long run? Yes, but this gets me where I need to go.

I discussed your plan of checking one bearing with my wrench when I was planning on using him to do the work and he descibed exactly what you are proposing. Makes sense to me.

Thanks for the advice.

[HarryD]

Originally posted by rcwaldo
think about the rear main seal. the downside is you should replace the flywheel bolts as well. what about head studs?

If you need any long distance help or reference pics, I will help you out. Just did a complete 2.7 rebuild last year.

Chris

If I need to address the flywheel, it will happen.

As far as head studs, I have a 2.4L CIS T engine. The expectation is no stud problems. Remember., this is a 140 hp, low compression engine. If needed, they will be addressed.

[HarryD]

I just got off of the phone with a few parts places. Seems like rings for 2.4L CIS T engines no longer exist in the USA.

I hear I can get a (horrors ) non-german ring that would fit. Any thoughts out there?

I figure that if I can't get the rings, I ought to do a compression and leak down test to determine if my rings are ok before I tear down.

My downside is continuing to blow smoke and buy lots of oil. Hopefully, the parts will return to the USA.