Making sure I purchased the correct coil for a 1996 5.7L

[Ed Harris]

Pistons and cylinders looked good
No scoring nice and smooth
Taking the heads to machine shop tomorrow for a look over

 

[nola mike]

Pistons and cylinders looked good
No scoring nice and smooth
Taking the heads to machine shop tomorrow for a look over

How's the block look between the cylinders?

 

[Ed Harris]

Block looked good with a straight edge.
#7 cylinder tried to suck the intake valve in and made a tulip out of it. Machine shop has them now and is going through them.

 

[alldodge]

Block looked good with a straight edge.
#7 cylinder tried to suck the intake valve in and made a tulip out of it. Machine shop has them now and is going through them.

Suggest getting the injectors flow tested

 

[Ed Harris]

It’s carburetor
Also how do you tell if it is a Tbolt4 or 5 ignition?
Mine doesn’t say on the cover or nowhere

 

[alldodge]

It’s carburetor
Also how do you tell if it is a Tbolt4 or 5 ignition?
Mine doesn’t say on the cover or nowhere

Dang, carb and only number 7 tuliped, that's different
A tuliped valve is caused by lean mix and its got to hot in the cylinder.

Your serial number shows TB5

 

[Ed Harris]

Well AD the back story is I pulled the engine and replaced the ring gear on the flywheel. Then reinstalled the engine but I didn’t know when my son put the rear motor mount bolt in the water inlet line was kinked about half way under the big washer. When we run the boat I could hear jingling in the pipe so I stopped to check the risers and they were so hot you couldn’t touch them but my temp gauge showed good. This was a week before Memorial Day. Bad gauge…. so the engine did run hot and that’s when my loss of power started happening on Memorial Day but it really took a turn for the worse the next weekend when It got up on plane you could hear an exhaust leak. When I got it home that’s when I did a compression test. That’s the rest of the story.
My ignition module number is 807264-3 does that correspond to a Tbolt 5?

 

[alldodge]

Yes its TB5 the first item 26
https://www.mercruiserparts.com/bam/subassembly/31770/1939/40

 

[Ed Harris]

When setting the timing I need to ground the Purple/white stripe wire to put into base mode?
Should my timing be on 0 or should it be at 8 degrees in base mode?

 

[Scott06]

When setting the timing I need to ground the Purple/white stripe wire to put into base mode?
Should my timing be on 0 or should it be at 8 degrees in base mode?

if your timing spec is 8 it should be at 8 in base mode not 0. It is usually on the flam arrestor and also in the shop manual.

When you come out of base mode you will see the ignition module advance it some as the TBV is an active system where it is changing the advance based on engine conditions

 

[Ed Harris]

10..4
Thanks for all the help from everyone who contributed.

 

[todhunter]

Block looked good with a straight edge.
#7 cylinder tried to suck the intake valve in and made a tulip out of it. Machine shop has them now and is going through them.

Hey! We're tulip twins! I Tuliped #7 intake valve on my boat this past weekend too.

 

[Bt Doctur]

JB weld can fix that lol cold water on a hot valve will pucker it.
But it could e worse

 

[Ed Harris]

I got my heads reworked and have them reinstalled…..$410 later new intake valves and valve seals on all valves Exhaust valves were good and sealed good
1 question I have is my purple white wire for setting the timing goes into the wiring harness and don’t know where the end is so I can ground it. Does it run up to the dash or should it terminate somewhere else?

 

[Scott06]

I got my heads reworked and have them reinstalled…..$410 later new intake valves and valve seals on all valves Exhaust valves were good and sealed good
1 question I have is my purple white wire for setting the timing goes into the wiring harness and don’t know where the end is so I can ground it. Does it run up to the dash or should it terminate somewhere else?

My purple and white wire ends near the shift plate by starboard exhaust elbow. There is a plug in the end of it I just use a jumper
Wire with alligator clips one end in the wire the other end on a good engine ground

 

[achris]

1 question I have is my purple white wire for setting the timing goes into the wiring harness and don’t know where the end is so I can ground it. Does it run up to the dash or should it terminate somewhere else?

The purple/white wire just runs from the ignition module to the open end of the connector you ground to put it in base mode. It's all of about 10cm long....

Chris....

 

[Ed Harris]

I will look for it after I get it all back together
Valves have been run and TDC found and distributor rotor set to #1
It rains so much it’s been a slow go

 

[Ed Harris]

Found my purple white wire for grounding.
What RPM do you run at the set the base timing for this engine?

 

[Scott06]

Found my purple white wire for grounding.
What RPM do you run at the set the base timing for this engine?

Idle set the timing to spec which I think will be 9 or 10 deg btdc depending on vortec or not

Once timing is set remove the jumper. When you get it on the water and in fwd set the idle speed to spec which is around 650 rpm. Key to make sure the throttle cable is adjust such that the throttle can return

I have set my idle speed on land about 75-100 rpm higher than in water spec gets u in ballpark set final speed on water

 

[alldodge]

Idle speed 650 to 700 RPM
TBV will lock into base timing mode
Set timing at 8 BTDC