Question about 1965 Mustang HB timing mark
10-09-2008, 08:26 AM
#1
Thread Starter
Join Date: Oct 2008
Location: Rhode Island
Posts: 2
Question about 1965 Mustang HB timing mark
I'm restoring a 1965 Mustang with a 289/302 engine. The engine is out of time after I rebuilt it. I tried using a timing light but I can't find the mark on the harmonic balancer. Does anyone know if there is a standard spot on the HB where the timing mark usually is? If so could you tell me how many degrees the mark is from the key? Any help is greatly appreciated. Thanks for your time.
Last edited by EVILonWHEELS; 10-09-2008 at 08:33 AM. Reason: added question
10-09-2008, 10:56 AM
#2
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
the balancers are known to slip.
in any case switch off the engine, pull 1st cylinder spark plug
have someone manually rotate the engine and you can feel the piston coming up with a long welding wire or similar. if the other person turns very slow at TDC you might have to turn back and forth a few times to get the hang of it you will feel the piston not coming up anymore. make a mark on the balancer with Tip-Ex or similar (just where the indicator is)
now turn over TDC until you feel the piston going down and do the same thing again from the other direction mark where yu stop feeeling it coming up.
between those two marks is TDC.
Verify this mark again. maybe swap, that worked good for us.
Once you have that done you can time it off that if you have a timing gun that can set initial advance
if you have a static gun, you will need to make a marking at the degree you want to time at
example 7" dia balancer->circumference is 22" (pi*dia)
1 degree is 0.06" (circumference/360).
So if you want a mark for 8 degrees it's about 0.5" away
most correct calculation for this would be: 7*3.1415926/360*8 -->0.49"
if you don't know the dia of the balancer you might just measure the ci4rcumference and go from there.
if you know the diameter you can always buy glue on timing marks, but there's no guarntee the balancer won't slip again ...
hope it helps. summit and jegs sell piston stoppers that will ease up the process of finding TDC (instead of using a wire). but i';m a bit scared of them as i'm afraid to leave them in which will destroy my piston when I forget ....
in any case switch off the engine, pull 1st cylinder spark plug
have someone manually rotate the engine and you can feel the piston coming up with a long welding wire or similar. if the other person turns very slow at TDC you might have to turn back and forth a few times to get the hang of it you will feel the piston not coming up anymore. make a mark on the balancer with Tip-Ex or similar (just where the indicator is)
now turn over TDC until you feel the piston going down and do the same thing again from the other direction mark where yu stop feeeling it coming up.
between those two marks is TDC.
Verify this mark again. maybe swap, that worked good for us.
Once you have that done you can time it off that if you have a timing gun that can set initial advance
if you have a static gun, you will need to make a marking at the degree you want to time at
example 7" dia balancer->circumference is 22" (pi*dia)
1 degree is 0.06" (circumference/360).
So if you want a mark for 8 degrees it's about 0.5" away
most correct calculation for this would be: 7*3.1415926/360*8 -->0.49"
if you don't know the dia of the balancer you might just measure the ci4rcumference and go from there.
if you know the diameter you can always buy glue on timing marks, but there's no guarntee the balancer won't slip again ...
hope it helps. summit and jegs sell piston stoppers that will ease up the process of finding TDC (instead of using a wire). but i';m a bit scared of them as i'm afraid to leave them in which will destroy my piston when I forget ....
Last edited by kalli; 10-09-2008 at 10:58 AM.
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