Crank Reluctor Clearance Help
Thread Starter
Racer
Joined: Sep 2009
Posts: 460
Likes: 6
From: Houston
Crank Reluctor Clearance Help
This has been bothering me for a few days so I took a few pics in hope of some guidance. What is the accepted clearance between the #5 main cap and the crank reluctor wheel? I have a hair over 0.011" clearance as checked with a 0.011" feeler gauge. I checked run-out and it is 0.020" (within the 0.028" max spec). The block is a new LS3 and the crank is a K1 with a 24x wheel. The engine was built by a reputable LSX shop in Houston.
What bothers me the most is that to install this wheel (as per precision engine) there is a 0.007" interference fit with the crank and when heated to 450*F it slides right on. Will thermal expansion of the #5 block main or cap main cause a problem? Any help would be great before running a bad wheel screws up my brand new block.
What bothers me the most is that to install this wheel (as per precision engine) there is a 0.007" interference fit with the crank and when heated to 450*F it slides right on. Will thermal expansion of the #5 block main or cap main cause a problem? Any help would be great before running a bad wheel screws up my brand new block.
Last edited by o1Z0sick; Nov 6, 2011 at 11:08 PM.
Thread Starter
Racer
Joined: Sep 2009
Posts: 460
Likes: 6
From: Houston
Does anyone else have their engine on the stand? Can you check this dim for me?
Tech Contributor
Joined: Jan 2007
Posts: 19,419
Likes: 1,146
From: Dyer, IN
What bothers me the most is that to install this wheel (as per precision engine) there is a 0.007" interference fit with the crank and when heated to 450*F it slides right on. Will thermal expansion of the #5 block main or cap main cause a problem? Any help would be great before running a bad wheel screws up my brand new block.
I would not be concerned about the CTE, as much as how you are taking the measurement. Have you incorporated your crankshaft end play measurement?
Thread Starter
Racer
Joined: Sep 2009
Posts: 460
Likes: 6
From: Houston
I'm not sure I understand your concern here. The interference fit, is between the ID of the reluctor, and the OD of the crank. If the reluctor is heated, this facilitates installation, and then becomes secure as it cools. When the crank and reluctor are heated(at the same rate during engine operation), it will stay in place......because there is no disparity in temperature.
I would not be concerned about the CTE, as much as how you are taking the measurement. Have you incorporated your crankshaft end play measurement?
I would not be concerned about the CTE, as much as how you are taking the measurement. Have you incorporated your crankshaft end play measurement?
The measurement is taken with the crank pushed back, end play is 0.004".
Maybe this is the way GM designed it to fit, but damn that's tight IMO.
Tech Contributor
Joined: Jan 2007
Posts: 19,419
Likes: 1,146
From: Dyer, IN
I am referencing the clearance or gap between the main cap and reluctor wheel. If the main and wheel both expand at temperature they move closer together making the clearance smaller.
The measurement is taken with the crank pushed back, end play is 0.004".
Maybe this is the way GM designed it to fit, but damn that's tight IMO.
The measurement is taken with the crank pushed back, end play is 0.004".
Maybe this is the way GM designed it to fit, but damn that's tight IMO.
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