Troubleshooting burnt crank thrust in front of C6 - 460 Ford Forum
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post #1 of 10 (permalink) Old 07-11-2013, 12:10 PM Thread Starter
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Troubleshooting burnt crank thrust in front of C6

Installed a custom valve body (full auto) on my C6 a few months ago. Rear main seal started leaking a little. Kept getting worse. Checked the crank end play and the thrust is wiped on the rear side. Is this a coincidence? What do I need to check on the tranny to make sure the converter is not pushing on the crank?
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post #2 of 10 (permalink) Old 07-12-2013, 03:47 AM
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Cooler line/ Converter pressure at the front line to the cooler, + check the converter hasn't ballooned , as in has freeplay or can be pushed back into the trans when unbolted.
Unusual for a C6 to do this
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post #3 of 10 (permalink) Old 07-12-2013, 05:44 AM Thread Starter
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Thanks for the reply Greg. I flushed and cleaned the lines and cooler yesterday because I thought I had heard someone in the past mention this. The fluid was clean and I could blow through easily. The converter had about 1/4" play backwards after unbolting it from the flexplate. Is that too much?
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post #4 of 10 (permalink) Old 07-13-2013, 04:02 AM
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Need to see what the pressure is in the cooler circuit. If that's high it maybe pushing the converter forward pushing towards the thrust.
1/4" is prob a bit much if that's what you have. most sources say 1/8-3/16" You can pull the converter too far out as well but in your case with good clearance is not causing your thrust issue.
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post #5 of 10 (permalink) Old 07-13-2013, 09:58 AM
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I wiped the thrust on my 347/c4 combo a few years ago. I had added a second cooler inline. I used a short line to connect the 2 coolers. When I took it apart to fix the thrust I re-routed the lines and used a longer line to connect the coolers (larger Radius) Haven't had an issue for 4 years now. If the converter hasn't balooned then It's most likely a restriction in the cooler circuit
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post #6 of 10 (permalink) Old 07-13-2013, 06:40 PM Thread Starter
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Quote:
Originally Posted by gregaust View Post
Need to see what the pressure is in the cooler circuit. If that's high it maybe pushing the converter forward pushing towards the thrust.
1/4" is prob a bit much if that's what you have. most sources say 1/8-3/16" You can pull the converter too far out as well but in your case with good clearance is not causing your thrust issue.
Would you recommend putting a pressure gauge in the cooler line to check? What is the max safe pressure? Which of the lines coming out of the tranny are pressure and return?
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post #7 of 10 (permalink) Old 07-14-2013, 02:40 AM
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You need to tee into the line from the front of the trans to the cooler . See what you have . Will likely see anywhere between 20-65 psi
Good point above also , a restriction in the lines somewhere or on the return could be a cause
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post #8 of 10 (permalink) Old 07-14-2013, 07:56 AM Thread Starter
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Yeah thanks for the tip ustahava67. I'll check to make sure the lines aren't kinked or have too sharp of bends. Greg do you think a pressure reading while the engine is revved a little in neutral will be accurate or does it need to be while driving?
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post #9 of 10 (permalink) Old 07-14-2013, 05:02 PM
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Yes that will work fine . Take a reading at idle and say up to around 3000RPM will be sufficient. Actual pressure doesn't matter , it is more looking to see if it is something silly that's way higher than it should be .
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post #10 of 10 (permalink) Old 01-19-2014, 01:30 PM
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I'm having the same issue and getting ready to start the motor back up after fixing it. Did you have any luck in figuring out the problem?
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