Timing marks 1972 1150...

[DVTO2]

I replaced my timing belt this week. The flywheel was marked already and there are some marks on the distributor pulley 1) an arrow, 2) a little stud that the plate on top of the pulley goes in, 3) a tab on the bottom of the pulley, and 4) a tab on top of the distributor. I did not take a picture before I started dismantling things, but when I put it back together, I could not get the arrow on top of the pulley to line up with the mark on the flywheel, and still have the tabs lined up - if I lined the arrow up with the flywheel mark the tabs were offset a little. Am I doing something wrong here (you can't see the arrow on the top of the distributor pulley because it is under the top plate on the pulley, but it is lined up with the mark on the flywheel) :

 

[merc850]

Re: Timing marks 1972 1150...

Here's the Manual methodthe only thing that is important for initial timing is the relationship between the dist. pulley arrow and the 3 dots on the flywheel.

 

[DVTO2]

Re: Timing marks 1972 1150...

Here's the Manual methodView attachment 165322the only thing that is important for initial timing is the relationship between the dist. pulley arrow and the 3 dots on the flywheel.

OK, Thanks. I do not have a decal but I am going to assume that the painted stripe on my flywheel is where the three dots are supposed to be. In fact, I did align the arrow to the left of the stripe. I think I may move the distributor pulley one tooth to align it to the right as suggested by the manual. Thanks, again.

 

[Chris1956]

Re: Timing marks 1972 1150...

Those three punch marks are where the cast arrow on the distributor should point to. If you can accurately measure the circumference of the flywheel, you can divide it by 360 degrees and figure out where TDC and the idn timing are supposed to be. When the cast arrow is pointing accurately, the TDC mark should be to the left of the punchmarks, aligned with the Timing mark on the cowl support.

 

[DVTO2]

Re: Timing marks 1972 1150...

Thanks, Chris!

 

[freemanow]

Re: Timing marks 1972 1150...

Question, this is my 1st try at timing my 72 1150 ser #3367765 and it doesnt have or is missing an adjustable pointer. Any idea?

 

[mercurymang]

Re: Timing marks 1972 1150...

Do you have a little plastic pouch on one side of the motor. If so, that's where it is supposed to be. If you're lucky, it's still there.

 

[freemanow]

Re: Timing marks 1972 1150...

Do you have a little plastic pouch on one side of the motor. If so, that's where it is supposed to be. If you're lucky, it's still there.

No pouch, and if there was, where would the pointer attach. pics please. Do you agree with this direction? quote(

Align the 3 dots on the side of the flywheel with the center of the distributor. At this time a tang on the dist. pulley will align with a tang on the mounting flange of the block. Slip the timing belt over the pulley. If it won't align perfectly it will if you go 1/2 tooth off. Follow the service manual.
Install the dial indicator and find TDC. Check that the timer pointer is pretty close to the decal's TDC. Now set the dial indicator at .464 before TDC. Do this by turning the flywheel backwards past the .464 then gently bring it to the .464 on the indicator. The pointer on the engine should be pointing to the .464 on the decal. If not move it to align it.
Now you can time the engine. With the shrouds and dist. pulley top plate installed you can start and run the engine. Do this with the lower unit in the water, NOT on a hose. You don't have to take the boat off the trailer.
With an inductive timing light time the initial pick up timing to the specified timing. You can fudge the timing up a degree or two if necessary.
If the engine stalls, make sure your idle mixture adjustment of all three carbs is open 2 turns from lightly seated.
When you do your WOT timing time the engine to NO MORE than 21*, preferably 19*. This is due to the changes in fuels since the engine was manufactured. Set the timing and synchronization by your service manual.

You're done.) I read elsewhere that you line up the 3 dots to middle of dissy shaft then arrow on dissy pulley must face 3 dots? What is the correct way, this is a virgin 200hr approx motor and don't want to wreck it, thanks for your help, Mercurymang.

 

[Chris1956]

Re: Timing marks 1972 1150...

Timing marks on the older motors were on the cowling support. The cast arrow on the distributor pully should point to the three dots (or one dot), when the TDC mark on the flywheel matches the timing mark on the cowling support. Adjust timing belt to make it so.

To time it, remove all but #1 spark plug. Install them into their wires and tape 'em together and ground their bases. Now crank motor and adjust throttle until idle timing is 4-6* BTDC. Carbs should be ready to open, but still closed. If carb opening adjustment is necessary, loosen two bolts on underside of brass collar on midsection of distributor body. use a 5/16" open end wrench. Adjust collar until carbs are just ready to open and tighten bolts. You never moved throttle, right?

Advance throttle fully and crank motor. Use max spark advance set screw to adjust max advance to 21* BTDC. Lock it down. Use throttle stop to stop carb opening as they reach max opening. Use idle stop and throttle cable adjustment to set idle speed. Carb initial setting is 1-1/2 turns open from lightly seated. In reality, setting will be closer to 1-3/4 turns open.

 

[freemanow]

Re: Timing marks 1972 1150...

Timing marks on the older motors were on the cowling support. The cast arrow on the distributor pully should point to the three dots (or one dot), when the TDC mark on the flywheel matches the timing mark on the cowling support. Adjust timing belt to make it so.

To time it, remove all but #1 spark plug. Install them into their wires and tape 'em together and ground their bases. Now crank motor and adjust throttle until idle timing is 4-6* BTDC. Carbs should be ready to open, but still closed. If carb opening adjustment is necessary, loosen two bolts on underside of brass collar on midsection of distributor body. use a 5/16" open end wrench. Adjust collar until carbs are just ready to open and tighten bolts. You never moved throttle, right?

Advance throttle fully and crank motor. Use max spark advance set screw to adjust max advance to 21* BTDC. Lock it down. Use throttle stop to stop carb opening as they reach max opening. Use idle stop and throttle cable adjustment to set idle speed. Carb initial setting is 1-1/2 turns open from lightly seated. In reality, setting will be closer to 1-3/4 turns open.

Sounds right to me. I did the .464 thing roughly and this pic shows where all lined up. Does that look right to you?

 

[Chris1956]

Re: Timing marks 1972 1150...

Looks right, as long as the distributor pully cast arrow points to the dots on the flywheel. Motors with timing marks on the cowling support, don't use the .464 measurement, since the timing marks are not adjustable. I suppose you could make a new timing mark usign the .464 method.

 

[freemanow]

Re: Timing marks 1972 1150...

Looks right, as long as the distributor pully cast arrow points to the dots on the flywheel. Motors with timing marks on the cowling support, don't use the .464 measurement, since the timing marks are not adjustable. I suppose you could make a new timing mark usign the .464 method.

you have no idea how brain busting this experience this has been. It's taken me reading and looking through the forums to finally hear from you what I thought all along. Mine doesn't require the setting of the timing pointer. Thanks for all your help. I may be back as the reason this all started was because one day, it just would not rev up in the water in gear but could get it to 3500rpm in neutral. Old belt was original, dry and cracked. Hope this fix's it. One big positive is that with all the reading , I learned alot about these Merc's.

 

[freemanow]

Re: Timing marks 1972 1150...

well, timed it correct 4-6deg and 21wot.(front cover plate says set @23 deg?) starts and runs not bad. got 5200 rpm neutral and 3500 in gear before it propped all the water out of the barrel. PROBLEM, idle @6-800 good, put in gear and wont idle, all @1 3/4 turns, screwing in idle mix on center carb makes no diff. same action on other 2 and motor will die. Pull wire off #3, motor revs up about 50rpm, replace wire, slows back down. pull off #4, dies. verified good spark @#3, # and 4 comp @ 147+148psi, so, Carb kit? where tobuy? sat for 5-8 yrs before me, but top and bottom carbs run great, so far. Your thoughts?

 

[sourbsted]

Re: Timing marks 1972 1150...

I have all your similar problems at the moment. It struggles getting onto a plane or it won't at all. I have gone through checking timing, compression, etc..
Check your plugs to see if there fouled. I think my needle& seats are failing in mine causing the engine to drown in fuel. At idle its good but once I raise it to fast idle the fuel pressure rises and the needle seats leak. EBay is good for new floats,needle& seats. Your carb could be blocked up somewhere. Fuel pumps maybe weak to. I've been at this for 2 month's now. The frustration! Lol

 

[sourbsted]

Re: Timing marks 1972 1150...

Are you certain its on TDC? Like removing the top spark plug, dial indicator test. I snapped a belt and had all sorts of issues trying to find TDC. It DIDNT idle well in the water either, the timing belt was a tooth out.

 

[freemanow]

Re: Timing marks 1972 1150...

timing triple checked, new plugs, like i said, idles good, 5400 in neutral, 3500 in gear and on its way up in barrel. had to shut down due to emptying barrel. my ? is why would it rev up when #3 wire is removed, i hear and see it sparking? I'm thinking needs carb kit, thanks for the info, good luck with yours.

 

[Laddies]

Re: Timing marks 1972 1150...

Your engine will not rev up in a barrel or idle in gear properly, inless it's a long horse tank as the water can not be displaced by the prop.

 

[sourbsted]

Re: Timing marks 1972 1150...

You could try cleaning out the dizzy cap, aswell checking the lead that goes into coil. Carb kit would be a good idea. Sounds like you have done everything else