2007 4.3L TKS Mercruiser starts and runs then dies after about 30 minutes.

[Rcantu2]

Thanks Alldodge...

 

[Rcantu2]

AllDodge you sure its not manual 25 it gives a sequence on sheet 3A-25 at 35 LB-ft and its for 262 CID (4.3L) Engines.

 

[alldodge]

Thanks for double checking me, and I did look at the V* model, and should have been manual 32 (start with S/N 0M322781), but the torque specs are the same

In post 1 you said it was a 2007 motor, an by looking at your intake, it appears to be aluminum. Manual 25 is 1998 to about 2000 (see S/N above)

 

[Rcantu2]

Oh ok I got thrown off by the MPI part of manual 32 that’s why I went to 25. My intake is cast iron..

 

[Rcantu2]

Thanks for the help... I have a new intake on the way.

 

[alldodge]

Check your serial number

Will say this 132 in lb = 11 ft lb, and the torque table in manual 25 page 3A-2 shows 11 ft lb, and manual 24 for V8 shows 18 ft lb

Need to do some more checking

 

[Rcantu2]

Ok so I got the new intake in and all set but now the distributor is off. How do I get it set right.

 

[alldodge]

Ok so I got the new intake in and all set but now the distributor is off. How do I get it set right.

Need to set like it it was disassembled. Remove port valve cover an bring the motor around until the 0 mark comes up then drop the distributor in. Either that or drop it in at the 0 mark, and if it backfires, remove and rotate 180 degrees and try again

 

[Rcantu2]

Which way do I turn clockwise or counter clockwise?

 

[alldodge]

Which way do I turn clockwise or counter clockwise?

From the front of the motor CCW, and use the stsrter to bump it around, not the front crank shaft bolt

 

[Rcantu2]

Ok so don’t turn the front of the shaft bolt..... I’ll try it today and report back.

 

[Rcantu2]

I got it to TDC and started it up and it ran with a rough idle for about 30mins or so then it backfired out of the carb with a flame. Any thoughts?

 

[alldodge]

Your out of time. While its running, rotate the distributor a bit one way or the other until it smooths out. Have a timing light to set timing at 10 BTDC

To set timing you need to take a jumper wire from ground to the Purple/White wire coming from the distributor. Ensure your RPM is at 650

 

[Rcantu2]

Ok so yesterday I removed the intake and the right side valve cover. I reset the intake and found TDC again. Then installed the distributor and the valve cover. I also replaced the thermostat and today it ran well over an hour with no problems. I think it’s finally fixed.

 

[Rcantu2]

Thanks everyone for all the help...

 

[Rcantu2]

So here’s what I think happened. Alldodge you can correct me if I’m wrong. The thermostat was stuck at 140 degrees so I had restricted flow into the intake causing the crack. The engine temp sensor activated and shut off the fuel pump because it was too hot causing the carb to run out of fuel.

 

[alldodge]

Don't know what caused the intake to crack, but most time they crack there is from freezing, others have more info

The Temp switch in this pic is to keep power on the TKS module after it warms up, it has no effect on the fuel pump. The oil pressure switch is what keeps power on the pump

 

[Rcantu2]

Well it sounded good...But either way it’s fixed.