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Flywheel Bolts & lock washers

July 1 2012 at 11:36 AM
Jeff F  (Login fast68gt)
Members

Hey guys does a 390 have lock washers under it from the fact ? some one put lockwashers on the flywheel bolts & they dont look like a fomoco washer .. the flywheel bolt is rubbing the clutch plate springs slightly thanks Jeff

 
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Leland
(Login lhstanford)
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no washers are used

July 1 2012, 1:36 PM 


 
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Leland
(Login lhstanford)
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make certain they're correct bolts

July 1 2012, 1:59 PM 

originals will have shallow castellated heads and use a little threadlock/loctite.when torqued.

 
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Jeff F
(Login fast68gt)
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thank you

July 1 2012, 2:58 PM 

thanks for the help .. i always get the answers here .. jeff

 
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Lars
(Login cdxxvii)
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Measure the length

July 1 2012, 3:13 PM 

If the bolt is 1" long it may touch the block. The original Ford bolts were 15/16" long. The Ford Racing replacement bolts are too long out of the box.

 
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Dave Shoe
(Login daveshoe22)
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Three different common lengths.

July 1 2012, 10:08 PM 

The flywheel flange bolts can be any of three different factory lengths, and aftermarket flywheels may require a different length. All are commonly available through ARP and other sources. Use only bolts specifically designed for flywheel flange applications.

The manual flywheel is the longest flange bolt, the flexplate with reinforcement ring is mid-length flange bolt, and the flexplate without reinforcement ring is shortest flange bolt.

Flywheel bolt must use about all the threads on the flywheel flange without significantly poking through and hitting engine block. Note that some castle bolts have a tall head and will hit the torque converter if a reinforcement ring is added. Make sure the flywheel bolt head is sufficiently low-profile to clear the torque converter if a ring is used. Since the flywheel and flexplate don't significantly deform over time under the bolt head, flywheel bolts tend to clamp just fine using "bolt stretch" without loosening and so I suspect they generally don't need to use loctite.

Shoe.

 
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