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BHJ Harmonic Balancer Installation


A common problem with the stock harmonic balancer aka vibration damper
is it's prone to cracking at the snout.




BHJ is the only aftermarket balancer offered for the 3.8L engine.
The balancer is "Neutral Balanced" which means it has no counter weights
added to it for proper engine balancing. All Supercoupe engines uses the
neutral balanced balancer on all 1989-1995 cars. BHJ harmonic damper features
a TDC mark and are degreed from 0 to 10 degrees ATC and 0 to 50 degrees
BTC in 2-degree increments for accurate ignition timing. I suggest adding
numbers using a dremmel type tool to scribe into the metal. Since the balancer
is steel I suggest spraying a coat of clear high temp paint to prevent
rust.




Before Installing the BHJ you will need to replace the OEM balancer
bolt which is grade 10.9 M14 x 40mm x1.5 pitch


with a longer grade 10.9 M14 x 50mm x 1.5 pitch bolt.

MN12 Performance Inc. offers the correct bolt/washer needed when
installing a BHJ on your SC for $6.


E-mail [email protected]
or call 703-968-6513






The reason for needing a longer bolt is the stock OEM balancer has
a 2" snout depth while the BHJ has a 2.5" snout depth.






Remove the OEM balancer using a balancer puller. These can usually
be rented or loaned from most autoparts stores.


The pulley uses M8 x 1.25 pitch threads. Ford OEM balancer removal
tool is part number T58P-6316-D or


OTC part 303-009 retail price is $80


Check the crankshaft snout for and nicks and clean.

File down any nicks before installing the BHJ balancer to prevent
problems.


Now you will need to remove the crankshaft timing ring and install
it on the BHJ.


Remove the timing ring from the OEM crank and clean. 4 bolts hold
the timing ring in place.


Brake cleaner, compressed air will work.

When all 4 holes on the BHJ are lined with the timing ring holes
you are ready to install the 4 bolts.


Add some locktite thread locker and Torque to 8-10 ft-lb

Note: A digital gauge is helpful to verify balancer ID before
installing on crankshaft.


My crankshaft diameter is 1.385" while the BHJ ID was 1.355".

I used a digital mic to verify the two diameters.

I removed .015" from the ID of the BHJ to provide the proper
tolerance of .001" - .0015" per BHJ specifications.




Apply gasket sealer to the slot in the balancer before installing.
This will keep oil from leaking


out of the balancer via the keyway.





You can use a balancer install tool which OTC sells. This one is
Ford part number T82L-6316-A or


OTC part 303-175 retail price is $40



Install the new balancer over the crankshaft snout until it is fully
seated.


Torque the NEW damper bolt to 110 - 130 ft-lb.



To hold the engine from rotating while tightening the crank bolt
you can access the flywheel from


the access cover plate at the bottom of the transmission and using
a wrench or wratchet to keep


the engine from rotating. My choice is a screw driver inserted through
the flexplate or flywheel.




Add a little color to the timing marker will help if you need to
check the timing. If you need to


reinstall the Cam Position sensor you will need to find 26 degrees
ATC on the balancer which is


1.30" from TDC mark on the balancer. Easiest way to locate the 26
degree mark is to cut out a


piece of masking tape 1.30" long and place on the timing marks starting
at TDC.









MN12 Performance Inc.

[email protected]

www.mn12performance.com

703-968-6513
 
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