3.0 Timing Question

[Mike1004]

I have a quick timing question for a Mercruiser 3.0 SN is 1A648581.

I'm have had it out a few times since rebuilding but went out tonight to re-torque a few bolts and just check over things. I also wanted to recheck the timing.

Start it up and warm it up and idle it.

Connect jumper and short out shift interrupter.
Confirm timing is at 2 ATDC with with advanced light.

Take out jumper and reconnect shift interrupter.

Check at idle with advanced light set to 15 and it's bang on 0 degrees.

Bring up to about 2600rpm and set light to 26 and the mark is sitting at about 4atdc so the way I read it this is +/- 4 degrees as opposed to the required +/- 2. If I bring the light down to about 23 it shows right on 0. Am I misreading? Is this going to be an issue? Or is everything ok?

Thanks!

Mike

 

[alldodge]

Spec between 2400-2800 rpm it should be 24 to 28* BTDC
With it reading 4ATDC at 26* then your getting 22* BTDC which is a tad low but will not hurt anything, just a bit lower on power.

Does is get better at 2800?

If its rock solid you could advance it a bit further

 

[alldodge]

BTW, does the motor label list 2ATDC?

 

[Mike1004]

BTW, does the motor label list 2ATDC?

It does list 2ATDC on the flame arrestor from the original engine (2012). I switched everything over to a new Long Block that was a new Mercruiser part (not rebuilt or reman) for that SN.

It runs well and is nice and smooth. I may leave it for the time being if it's not going to damage it.

Would this be caused by the ignition module? I am definitely ok with replacing it, I am way ahead on this project so a couple hundred bucks isn't going to bother me.

Thanks for the reply.

Mike

 

[alldodge]

Yes, the module controls timing, but I would test all components in the distributor before replacing it
Do agree just run it, it should be fine and recheck later