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3.6l crankshaft in a 3.4l crankcase

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCH3.6l crankshaft in a 3.4l crankcase

Leading reported evidence

Use different main journal diameters

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No successful repair reported for this finding.

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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

The two use different main journal diameters.

Original post Read captured discussion
3.6l crankshaft in a 3.4l crankcase
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Leading evidence: 'Use different main journal diameters' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use different main journal diameters' (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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1 matching discussions · 6 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Use different main journal diameters

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

The two use different main journal diameters.

Original post Read captured discussion
3.6l crankshaft in a 3.4l crankcase
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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.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Could a 3.6l crankshaft with it's bearing case be installed into a 3.4l crankcase without large modifications? Ie. will the 3.4l crankcase accept longer stroke without interference? TIA, Pete

POST 2Original post

Not sure of what needs to be done but a while back Strasse Auto in Newport was fitting a 3.8 crank in a 3.4 eng always wondered how that turned out.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 6939717

I just checked this from the PET. 997 crankshaft and crankcase carry 996- part numbers, as a matter of fact only the last digit is different between 996 3.6l and 997 3.6l or 3.8l. Just like to know if someone has first hand knowledge about this.

POST 5Original post

I imagine the chain drive gears are different, so it might not be a direct fit...

POST 6Original post

The two use different main journal diameters. Due to this you must either highly modify the 3.4 carrier, or retrofit a 3.6 carrier to the 3.4 case. Both of these are normal occurrences for us, but they both have their own set of challenges. What M code designation is your 3.4L?

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