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-   -   502 timing after ignition tune up (https://www.offshoreonly.com/forums/do-yourself-boating-budget/372540-502-timing-after-ignition-tune-up.html)

sutphen 30 07-17-2021 10:12 PM


Originally Posted by Bstocky (Post 4797980)
so can I pull the distributor up and rotate it back counter clock wise?

you need to turn the oil pump drive a liitle back so distr. will go back to where it once was.

fbc25el 07-18-2021 08:56 AM

Turn the engine over till the timing mark is on 8* compression stroke. Take the cap off and see what wire it is pointing at.

liberator221 07-19-2021 05:20 AM

Bstocky, get your boat going?

ThisIsLivin 07-23-2021 11:45 AM

How old is your balancer? I've seen balancers way off too.

GETTINBYE 07-23-2021 04:09 PM

Pull # 1 spark plug. Place your finger in the hole. Have someone bump the starter until you start to fell compression and stop at this point. Note how the timing marks are lined up on the balancer then hand rotate the engine to align the balancer mark-groove with the pointer. Pull distributer cap and note which wire location the rotor is pointed at. If not at #1 or REAL CLOSE remover the distributer and re install it so it does point to # 1. You will need to slighlty rotate the rotor counter clockwise to account for the gearing. As stated it may be necessary to rotate the oil pump slot to line up with the dist.

Mark

Rayman390 07-26-2021 11:29 AM

Spark timing
 

Originally Posted by Bstocky (Post 4797923)
I have verified they are the right spots. When I set my timing gun to 8 degrees and shoot the crank, it’s past 60°, when I twist the the distributor and start getting to 50 and 40 the rpms start climbing much higher.

The ignition timing is preset in the ecm calibration.You didn’t need to replace the pick up
coil they rarely fail.Bring cylinder one to tdc and set the distributor to #1 on the cap
and line up the points on the pick up coil and lock down the distributor.Timing should be
right on based on the calibration which you can’t change.


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