1989 Force 85 HP Timing Issue

[NHForce85]

First time iboats forum user, lifetime boater!

On the flywheel of my 1989 Force 85 HP, I see 4 timing markings. Three lines close together which I believe are 28, 30 & 32 degree markings. About 2-3 inches to the right of the three lines (as you face the engine from the front) is another single line. At idle, and using a timing light, the single line is just about centered with the timing marker on the block just below the flywheel. Does sound right? The block timing marker is on a casting just below the flywheel, centered on the front of the engine? Just want to be sure I have the right marker!

Also, at WOT, should the 30 degree marker be centered with the block timing marker?

I have the Force manual, which is very helpful, but comes up short on timing issues.

Thank you!

David

 

[baxtr]

Re: 1989 Force 85 HP Timing Issue

single mark should be TDC of # 1 piston Timing is set at WOT manual says 32 but I have read that with todays fuel it should be retarded to 28 static, which I believe ends up at 30 (center mark of the 3) while it is actually running.

 

[NHForce85]

Re: 1989 Force 85 HP Timing Issue

Thanks for the quick response! This is a new boat for me, and it has been a while since I've had to deal with 2 cycle engines...and apparently more complicated in that I'm dealing with a Force engine!

To do the static test, do I disconnect the linkage so I can manually move the timing linkage to it's max, and then check it with just the starter motor cranking, with timing light, or is is better to do this in the water at WOT, than with just the starter motor?

Thank you!

David

 

[Frank Acampora]

Re: 1989 Force 85 HP Timing Issue

If that is where both marks are while running at idle and at full throttle, then the timing is correct--leave it alone.

Static timing should be 28 or the closest line to the single line. That will give 30 at actual running at WOT. Since there is no advance cam like in old auto distributors, you can only set the WOT timing. Idle timing will usually fall somewhere between plus 2 and minus 2 deg. If it ends up outside this range, the engine is improperly synchronized.

However, originally Chrysler engines (Which is what your Force actually is) were timed at 32 deg before TDC. Because during the late 1970s gas quality at marinas became spotty, the factory reduced the timing to 30 deg. You can use either setting if you want to take a chance; I run all my Chryslers at 32 with no ill effects. However the power increase from 2 degrees advance at full throttle will probably be negligible--you might get 1 MPH more. I don't know, I never tried it.

 

[NHForce85]

Re: 1989 Force 85 HP Timing Issue

Hello,

I have been searching for your thread on carb adjustments/syncronizing, but was not able to find it. (I have the 1989 Force 85 HP). Can you direct me to it, or paste it on your reply?

Thank you!

David

 

[NHForce85]

Re: 1989 Force 85 HP Timing Issue

Hello,

I have been searching for your thread on carb adjustments/synchronizing, but was not able to find it. (I have the 1989 Force 85 HP). Can you direct me to it, or paste it on your reply?

Thank you!

David

 

[Frank Acampora]

Re: 1989 Force 85 HP Timing Issue

Ah--Well--I still have a VCR that blinks 12:00. and don't even mention a disc player let alone an Ipod! Let me see if I can hunt up my own thread.

 

[NHForce85]

Re: 1989 Force 85 HP Timing Issue

Hello,

I appreciate your trying to find the thread, but don't want you to spend a lot of time on this.

David

 

[gmiles]

Re: 1989 Force 85 HP Timing Issue

http://forums.iboats.com/showthread.php?p=1667950