Motor Mount Replacement

Discussion in '6.9L IH & 7.3L IDI Diesels' started by renjaminfrankln, Oct 12, 2018.

  1. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    I think my IDI needs at least one motor mount. I get a loud metal to metal sounding rattle when I shut the engine off from the passenger side mount area.

    So I have seen some info on jacking the motor up from the lip of the oil pan to get clearance. Any other advice on replacing this mount?
     
  2. 79jasper

    79jasper Chickenhawk

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    Have you checked the DMF?

    Sent from my SAMSUNG-SM-G930A using Tapatalk
     
    73idi88f350 and icanfixall like this.
  3. icanfixall

    icanfixall Official GMM hand model

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    Next time you shut down the engine try pressing in the clutch. As already posted.. My guess is the dual mass flywheel is going bad. They do make plenty of noise but still work well too.As for the mount replacement nothing special but please don't lift the engine from the bottom of the oil pan. The oil pump suction is about 3/16 clearance from the oil pan bottom. Use the pan rail like you mentioned. Motor mounts have a left and a right side and.. they have a front and back direction of installation too.. Take pics as you remove it so the new one goes back the same way. Finally the bolt hex to the mount to block are metric but the mount to frame brace are standard.
     
  4. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    I will check the flywheel like you mentioned. So, press in the clutch, shut down and see if I get the same noise? If noise goes away, I likely need to replace the flywheel? Sounds fun! not!
     
  5. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    I’d rather do the flywheel than that drivers side motor mount haha
     
  6. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    Yeah I was lookin at those mounts yesterday ... eeesh

    I do get a bit of a shudder when the clutch is engaging.
     
  7. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    So in reading up on the flywheels... it looks like the preferred replacement is a single mass flywheel, larger 12" clutch with the extra springs, to help take out some of the dampening lost from converting from dual to single mass.

    https://www.rockauto.com/en/moreinfo.php?pk=334512&cc=1124299&jsn=557

    This setup is $250 and includes a bigger flywheel, clutch with the extra springs etc...
     
  8. 73idi88f350

    73idi88f350 Full Access Member

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  9. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    Thanks. That did not show up as an option on rock auto for my 89' IDI. But seeing as you have a 91' 7.3 with the 5 speed like I do, I'm guessing it will fit my truck just fine.
     
  10. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    I prefer Phoenix friction over the luk kits. Very affordable and I have ~80k miles on a stage one in the shop truck. That clutch has a hard life, and it’s holding much more power than it’s rated for.
     
  11. 73idi88f350

    73idi88f350 Full Access Member

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    i pick threw the diff years for what i thought was better my truck was orig a 88
    its kind of a Frankenstein lol now
     
  12. 73idi88f350

    73idi88f350 Full Access Member

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    ive always heard good things about luk.. im pushing a bit more then stock i got some r&d parts and head studs pushing 15psi
    i towed a car a few 100 miles after getting my truck back together and no slippage going wot not to say your clutch is junk.
     
  13. renjaminfrankln

    renjaminfrankln Supporting Member Supporting Member

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    So, it is definitely the dual mass flywheel. Not a big surprise there.
     
  14. 73idi88f350

    73idi88f350 Full Access Member

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    thats what id guess mine rattled like hell and was really loose when i removed it..
     
  15. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    You can check the dual mass flywheels fairly easily. Just remove the inspection cover and grab the back side of the flywheel that the clutch bolts to. You shouldn't be able to move it side to side much if at all. If it does, then the flywheel's bad.
     

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