2007 4.3 TKS Timing Procedure

[jan.w]

Hello!

New member here, I'm currently in the process of taking all the engine components off of my cracked block from a 2007 Sea Ray 185 onto a new GM longblock, but I've realized I don't know how to do the timing on this particular engine. What I've seen online suggests the process of doing the timing on my merc might be different than on a regular truck 4.3 V6.

Some info on the engine:




It's got the DENSO ignition control module on the side of the exhaust risers, and I'm not really sure how to deal with this unit in terms of installing the rotor and more specifically getting the engine running and setting the timing. I was wondering if maybe someone here has some experience with this motor and could provide me with some insight as to the proper procedure here.

Many thanks!

 

[Scott06]

You need to put it in base mode before setting the timing to 10 BTDC. http://www.boatfix.com/merc/bullet/94/94_02.PDF Should outline it. Just look for the timing base mode bullet connector just to the left of the carb. Ground it before you turn on the engine it prevents the adavance from kicking in so you can set initial timing.

 

[jan.w]

I see, I think this video showcases that connector you're referring to.

Is that all I have to do - ground that connector then proceed business as usual?

Thanks for your help!

 

[Bt Doctur]

SERVICE MANUAL NUMBER 25 THUNDERBOLT V IGNITION SYSTEM
90-861328--1 NOVEMBER 1999 Page 4B-5
Timing and Idle Adjustment Procedures
Setting Base Ignition Timing
1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power
supply leads, if applicable, on light to 12 volt battery.
2. Connect a shop tachometer to engine.
3. Using a jumper wire, connect the ignition system timing lead (PUR/WHT wire) to a good
engine ground (?). This locks the ignition module into the Base Timing Mode.
NOTE: Before starting engine make sure the timing tab and marks on damper are clean.
Chalk or white paint on timing marks may help visibility.
4. Start engine and run at normal idle speed. Allow engine to reach normal operating
temperature.
5. Aim timing light at timing tab, located on the timing gear cover and crankshaft torsional
damper.
6. If adjustment is required, adjust timing by loosening distributor clamp and rotating
distributor body as required until timing mark on damper or pulley lines up with the mark
on tab specified in ?Specifications.? Tighten clamp and recheck location of timing mark.
7. Make sure that the distributor has been tightened. Remove the jumper wire from the
timing terminal.
8. Remove jumper wire between the timing lead (PUR/WHT wire) and ground (?).
IMPORTANT: Be sure to disconnect the jumper wire from between the ignition system
timing lead and ground (?) before attempting to resume normal operations. If the
jumper wire is left in place, the ignition module will operate in the Base Timing Mode.
This means that the additional timing advance features would not function.
9. Stop engine and remove timing light.

 

[Fun Times]

Is that all I have to do - ground that connector then proceed business as usual?

Yes.

Now if you need to adjust the carburetor idle mixture screw then you'll also need to order an adjusting tool from Mercruiser part number 91-866201, http://www.ebay.com/sch/i.html?_fro...1313.TR0.TRC0.H0.TRS5&_nkw=91-866201&_sacat=0

 

[coolbucket]

You need to put it in base mode before setting the timing to 10 BTDC. http://www.boatfix.com/merc/bullet/94/94_02.PDF Should outline it. Just look for the timing base mode bullet connector just to the left of the carb. Ground it before you turn on the engine it prevents the adavance from kicking in so you can set initial timing.

I've had an issue with my 4.3 mercruiser popping and bogging after running great for 30 minutes. My Mechanic feels the Carb was messed with and wasn't set right. What's your thoughts?

 

[Scott Danforth]

I think you shouldn't re read the rules on posting in old threads