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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRod bearing Failure risk? Preemptive change? M96 engine.
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Check scoring, or other problems
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Suggestion · Original poster
The engine runs smooth, no odd noises, and feels like it has plenty of power, so I am not going into it because of a problem, but because I want to check for scoring, or other problems before they get worse.
Rod bearing Failure risk? Preemptive change? M96 engine.
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Leading evidence: 'Check scoring, or other problems' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check scoring, or other problems' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
Anyone have thoughts on replacing the rod bearings before failure as a preventative measure on a high mileage M96?
Rod bearing Failure risk? Preemptive change? M96 engine.
Replace rod bearings while i am in there
Suggestion or failed attempt
No successful repair reported for this finding.
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Unsuccessful attempts
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Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
Now, I know because of the case design on a flat 6, that I can't just roll in new crank bearings; but I could replace the rod bearings while I am in there.
Rod bearing Failure risk? Preemptive change? M96 engine.
Frequently discussed actions (3)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check scoring, or other problems
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The engine runs smooth, no odd noises, and feels like it has plenty of power, so I am not going into it because of a problem, but because I want to check for scoring, or other problems before they get worse.
Rod bearing Failure risk? Preemptive change? M96 engine.
Replace rod bearings while i am in there
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Now, I know because of the case design on a flat 6, that I can't just roll in new crank bearings; but I could replace the rod bearings while I am in there.
Rod bearing Failure risk? Preemptive change? M96 engine.
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T103553Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I am going to drop my oil pan of my newly purchased 1999 C4 996 with 171k miles on the odometer to inspect the bores and lower chain guides in the next few weeks.
The engine runs smooth, no odd noises, and feels like it has plenty of power, so I am not going into it because of a problem, but because I want to check for scoring, or other problems before they get worse.
I purchased for a very good price, so I have factored in a full engine rebuild around the 200k-250k mile mark, so for anyone saying I should have dropped the pan before purchasing, yes I know this, but for the price I took an educated risk.
I have been a mechanic for a long time, and have frequently done a lower in-frame bearing replace on high mileage engines, as the rod bearings in particular are most often the first to go. (because of the constant load pressure changes that rod bearings have to withstand.
Now, I know because of the case design on a flat 6, that I can't just roll in new crank bearings; but I could replace the rod bearings while I am in there.
This is the question I am asking; and I didn't see any other threads that discussed this specifically, but I am thinking of rolling in a new set of rod bearings while I am in there looking at the bores (assuming the bores are still as good as I expect them to be) .
Anyone have thoughts on replacing the rod bearings before failure as a preventative measure on a high mileage M96?
\Thank you,
Ah, this probably explains why I couldn't find anything on replacing rod bearings from the bottom.
Anyone else confirm or deny this? I will find out for sure when I open her up.
Thank you for the reply.
I did read through several full engine rebuilds, and at some point I will rebuild this one (Or a different block and swap) but are you confirming here that the rod cap bolts aren't accessible from the bottom? I assume that is what you are saying.
I'm finishing up a build right now, and I can confirm that you can not get to the rod bolts from the sump. That's why you need to install the rods for 4-6 to the bearing carrier before you put the halves together, and then marry up the pistons to the rods inside the bores.
This is a source reference. Confirm exact model applicability in the original material.
