Rebuilding 996's engine
Intermediate
Joined: Jun 2008
Posts: 37
Likes: 0
From this pic, the stud is intact. Is there more than one cause??
https://rennlist.com/forums/showthre...&highlight=ims
https://rennlist.com/forums/showthre...&highlight=ims
Track Day
Joined: Jul 2004
Posts: 21
Likes: 0
I have a related question. I just learned that the IMS "failed" on my 2000 C4 with about 50k miles. The IMS nut was indeed sheared off in the bellhousing. The car was still driving, however. At the shop, the tech showed me that there were metal flecks in the oil filter. I have an aftermarket warranty that may try to have the engine rebuilt as opposed to replaced depending on cost and degree of damage to the engine. The question I have is what the metal flecks in the oil filter likely mean about the nature and extent of damage to the engine and whether it is even possible to rebuild a 996 engine in this situation as opposed to replacing it.
Thanks for any info you may have.
Thanks for any info you may have.
1st Gear
Joined: Apr 2013
Posts: 1
Likes: 0
We have a 2000 996 with #7 main bearing damaged but crank surface good. #6 rod bearing is gone with some heat cracks on the journal. Has anyone welded up the crank and reground and hardened them with success. Customer is sick of pouring money in it. Not to interested in buying new crank and haven't found a used one yet.
Drifting
Joined: Dec 2009
Posts: 2,140
Likes: 76
From: Austin, Texas
You can rebuild an M96 engine.
I worked along side a mechanic and did it on my Boxster 4 years ago.
I have since done a couple more.
My mechanic made all his own special tools from Home Depot stock.
The hardest part is the piston wrist clips. The second set is a blind assembly.
The only tool we purchased was the camshaft holding tool -- but this could be made too
if one really wanted to.
mike
I worked along side a mechanic and did it on my Boxster 4 years ago.
I have since done a couple more.
My mechanic made all his own special tools from Home Depot stock.
The hardest part is the piston wrist clips. The second set is a blind assembly.
The only tool we purchased was the camshaft holding tool -- but this could be made too
if one really wanted to.
mike
Instructor
Joined: Mar 2009
Posts: 100
Likes: 0
From: Beyond the sun.
Jake Raby's company, Flat Six Innovations, holds M96 engine rebuilding classes from time to time. I believe they're about $1000-$1200, plus your travel costs. Given his reputation for building rock-solid M96s, that would be money well-spent if I were to tackle an M96 rebuild for the first time. I considered doing just that (I, too, am a decades-long gearhead and do all my own work). But after adding up parts and cost for machine work, etc., I decided to have Flat Six do the rebuild.
Of course that cost substantially more, and everyone's budget vs. time is different. There are some things they're able to do (port/polish using a flow bench, dynamic balance of rotating assembly, and so on) that I can't. Back to your question, though, I would check out their class and schedule. On a Porsche engine, not hard to mess up $1000 worth trying to totally DIY...
Of course that cost substantially more, and everyone's budget vs. time is different. There are some things they're able to do (port/polish using a flow bench, dynamic balance of rotating assembly, and so on) that I can't. Back to your question, though, I would check out their class and schedule. On a Porsche engine, not hard to mess up $1000 worth trying to totally DIY...
Instructor
Joined: Mar 2009
Posts: 100
Likes: 0
From: Beyond the sun.
The simple answers, I suppose, are, "Yes" and "No." The M96 ain't your daddy's big block.
Banned
Joined: Mar 2010
Posts: 7,697
Likes: 31
From: Chicago
We have a 2000 996 with #7 main bearing damaged but crank surface good. #6 rod bearing is gone with some heat cracks on the journal. Has anyone welded up the crank and reground and hardened them with success. Customer is sick of pouring money in it. Not to interested in buying new crank and haven't found a used one yet.
This is what I was referring to since this is the only recent question that was bumped since 2008 that immediately needed an answer.
I think it's safe to say the people from 2008 already got the answers they were originally seeking.
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Instructor
Joined: Jun 2010
Posts: 234
Likes: 0
From: San Antonio, TX
We have a 2000 996 with #7 main bearing damaged but crank surface good. #6 rod bearing is gone with some heat cracks on the journal. Has anyone welded up the crank and reground and hardened them with success. Customer is sick of pouring money in it. Not to interested in buying new crank and haven't found a used one yet.
I am sure that you could have a 3.4 crank repaired the same way with success. We just did not want to use the weld/grind since we are trying to push this motor to 600+ hp. My shop actualy used it on another build that was staying naturally aspirated unlike my turbo build.
Instructor
Joined: Mar 2009
Posts: 100
Likes: 0
From: Beyond the sun.
