Owain
Jerry has given you the best information.
Here is some information I have but I can't confirm total accuracy.
5.0L counterweight change to 50 oz in 1985.
Early crankshafts are marked 1M on the front counterweight.
302 crankshafts are marked 2M.
Early harmonic balancers have a 3 bolt pattern for the pulley.
1970 to present the harmonic balancer has 4 bolt pattern.
The 5.0L harmonic balancer, 50 oz balance, has drill holes on the front face
uniformly around the circumference.
The earlier Harmonic balancer generally only has drill holes in a couple of
location around the circumference.
The 1 part number on the balancer I have a reference to shows E4TE-6316-A3A.
Obviously the crank, balancer and flywheel all need to be the correct
balance weight or a vibration will result.
Hope this helps
Ron Fraser
-----Original Message-----
From: tigers-bounces+rfraser=bluefrog.com@autox.team.net
[mailto:tigers-bounces+rfraser=bluefrog.com@autox.team.net] On Behalf Of
Owain Lloyd
Sent: Monday, June 09, 2008 4:59 PM
To: Tiger's Den
Subject: [Tigers] flywheel surprise
i do apologize for the recent flood of incompetent questions! one day i
promise to buy you all a beer....
i just checked my old flywheel and it turns out to be the 50oz" type from
'82. my engine is a '72 mexico block 302.
now either the PO had the wrong flywheel (i was suffering from
vibrations!) or the engine has been rebuilt with a crank and balancer for
the later 50oz" imbalance. fortunately i was able to stop my order for a
28oz" from summit before it shipped.
the question is how can i tell what is the correct one to replace it with?
is it possible that the wrong flywheel was fitted or would that just shake
the engine to bits over 2000rpm? my only idea is to pull the oil pan and try
to identify the crank which may be hard if its an aftermarket crank.
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