 negative endplay |
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| cgnj |
 Sep 24 2025, 05:36 PM
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#1
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Senior Member  Group: Members Posts: 693 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None 
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Well, I'm stumped. Short of disassembling my engine again I have no other guesses.
No P&Cs, just crank and rods installed. Crank turns and moves fore to aft freely. No shims, no rear main seal, no flywheel o ring. When bolts are seated but not torqued, crank is frozen. As soon as i loosen the flywheel bolts, I can rotate crank and have some fore to aft movement. I swapped flywheels, same symptom. I'm thinking bearing problem but I am hoping I did something stupid and don't have to tear it down. |
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| Jack Standz |
Sep 24 2025, 11:16 PM
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#2
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Senior Member Group: Members Posts: 551 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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Wild guess.
Is the flywheel hitting something on the back of the engine case? Like a plug(s) in the oil galley(s)? |
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| cgnj |
Sep 25 2025, 04:23 AM
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#3
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Senior Member Group: Members Posts: 693 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None
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QUOTE(Jack Standz @ Sep 24 2025, 10:16 PM)  Wild guess. Is the flywheel hitting something on the back of the engine case? Like a plug(s) in the oil galley(s)? As I read this, I realized that this is the problem. Removed all the plugs when the case was cleaned, most likely did not fully seat the plugs. Glad I'm not flying a airplane. |
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| Jack Standz |
Sep 25 2025, 09:15 AM
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#4
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Senior Member Group: Members Posts: 551 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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IIRC the plug on the lower left side of the case is the one that causes the most problems as it sticks out the most.
But, you also want to be careful that you don't get too overly aggressive with drilling the hole for the tap. Best wishes for a successful fix! |
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| Nacho |
Sep 27 2025, 07:12 AM
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#5
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Member Group: Members Posts: 221 Joined: 31-December 16 From: So. California Member No.: 20,716 Region Association: None
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Did you replace the main bearings and are they the correct size? Make sure the dowel pins that keep the bearings from spinning are fully seated into the bearing and the case. Sometimes small pieces of crud can get stuck between the case & pin. Also, if they are new bearings did you get an oversized main thrust bearing? these tipically need to be machined down to fit.
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