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Old 10-22-2018, 08:50 PM   #1
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400 Cummins Exhaust Manifold Replacement tricks

# 3 cyl leaking on my 2007 8.8 400 hp engine,going to replace all gaskets. Have all new OEM parts. I am a retired auto tech with lots of experience on gas stuff but none of this stuff.
Gonna soak all bolts with PB Blaster several days before with a little tapping on the bolt heads to loosen things up. I have all the tools to remove broken bolts,just trying not to do so!
Thanks to all
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Old 10-22-2018, 09:03 PM   #2
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PB Blaster is good stuff, one year I Soaked wheel lug nuts on my salt water boat trailer all summer with liquid wrench, these had not been off in like 20 years, at the end of summer they came off with 1/2 impact like new, so liquid wrench is good also, sounds like you know what you are doing, good luck.
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Old 10-22-2018, 09:52 PM   #3
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If lucky and none break. Put a longer bolt in front and rear holes...slide manifold on those about 1/2 inch, then you can slide the new gaskets into place. Removing the manifold can open up lots of new issues.

Soaked mine heavily twice a day, four days, they all came out ok.

Good luck
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Old 10-24-2018, 11:01 PM   #4
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PB blaster has worked the best for me. Restored my 69 Barracuda and used it a lot. Give it a little time to work! Also used it on my 5.7 Cummins in the Dually and it worked great on the exhaust bolts!
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Old 10-25-2018, 05:39 AM   #5
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Quote:
Originally Posted by taz4028 View Post
# 3 cyl leaking on my 2007 8.8 400 hp engine,going to replace all gaskets. Have all new OEM parts. I am a retired auto tech with lots of experience on gas stuff but none of this stuff.
Gonna soak all bolts with PB Blaster several days before with a little tapping on the bolt heads to loosen things up. I have all the tools to remove broken bolts,just trying not to do so!
Thanks to all
I found it helpful to have a board to lay across the engine access opening in the bedroom. That allowed me to reset my chest on the board while reaching both arms down to work. I used a board again last month when replacing all the radiator hoses so decided to keep it for future use. It is hanging on the wall in my garage.

Bob
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