holy cow!
i just checked my crank and its marked "2M" on the front counter
weight which i understand is a 28oz crank. its had a 50oz flywheel on
there since i bought the car 5000 miles ago!
i'd better order a 28oz flywheel and balancer.
on the up side, there is already a windage tray installed :)
On Tue, Jun 10, 2008 at 3:23 PM, Ron Fraser <rfraser@bluefrog.com> wrote:
> 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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