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Old 09-02-2018, 10:11 AM   #1
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Allison at545 missing plug from bell housing?

Have this quick question, I hope someone can answer before I make the move on buying this bus. This is on a 1995 Thomas school bus. The engine is a Cummins 5.9 12 valve and transmission appears to be a Allison at545. My question, in between the engine and trans oil pans is the bell housing (?), I believe, Where you see a hole. It's a threaded hole and a plug appears to be missing. What is that hole? Is it for inspection or is it to hold fluid? I maybe buying this bus TODAY, depending on if this missing plug is a big deal or not. Please help!
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Old 09-02-2018, 12:07 PM   #2
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Originally Posted by NovaTRON View Post
Have this quick question, I hope someone can answer before I make the move on buying this bus. This is on a 1995 Thomas school bus. The engine is a Cummins 5.9 12 valve and transmission appears to be a Allison at545. My question, in between the engine and trans oil pans is the bell housing (?), I believe, Where you see a hole. It's a threaded hole and a plug appears to be missing. What is that hole? Is it for inspection or is it to hold fluid? I maybe buying this bus TODAY, depending on if this missing plug is a big deal or not. Please help!
It is a hole to access the bolts on the torque converter. No worries.
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Old 09-02-2018, 12:23 PM   #3
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It is a hole to access the bolts on the torque converter. No worries.
That's what I thought, thanks for confirming. I'm riding the train on my way Temecula CA to purchase this bus and drive it 1200 miles back to Seattle.
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Old 09-02-2018, 12:23 PM   #4
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Originally Posted by NovaTRON View Post
Have this quick question, I hope someone can answer before I make the move on buying this bus. This is on a 1995 Thomas school bus. The engine is a Cummins 5.9 12 valve and transmission appears to be a Allison at545. My question, in between the engine and trans oil pans is the bell housing (?), I believe, Where you see a hole. It's a threaded hole and a plug appears to be missing. What is that hole? Is it for inspection or is it to hold fluid? I maybe buying this bus TODAY, depending on if this missing plug is a big deal or not. Please help!
Like you said, it is a missing plug no big deal. My TC 2000 5.9 /AT 545 was also missing it. The only thing inside the bellhousing is the tourque converter and the ring gear, some would call it the flywheel.There is no lubricants in there. My guess is that it is an inspction port.
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Old 09-02-2018, 12:29 PM   #5
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Actually, no. The torque converter bolts come out through a small access panel on the drivers side forward of the bellhousing, right by where the hole is the barring tool fits into to rotate the crankshaft by hand.
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Old 09-02-2018, 12:39 PM   #6
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Actually, no. The torque converter bolts come out through a small access panel on the drivers side forward of the bellhousing, right by where the hole is the barring tool fits into to rotate the crankshaft by hand.
So is it an inspection port? Being that it's on the bottom AND threaded made it appear to be a drain plug.
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Old 09-02-2018, 12:41 PM   #7
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It is a hole to access the bolts on the torque converter. No worries.

If you look to the left of the mount, the big hole with light coming through is where you remove the torque converter bolts and the round boss above it is where the barring tool goes. The hole on the side of the bellhosing a few inches higher is where the optical sensor for the tachometer screws in.
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Old 09-02-2018, 12:45 PM   #8
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So is it an inspection port? Being that it's on the bottom AND threaded made it appear to be a drain plug.
Maybe to drain oil from your leaky rear main seal or from your leaky transmission mainshaft seal... but the bellhousing to the block and the transmission to the bellhousing is metal to metal with no seal or gasket.
It is supposed to be dry in there.
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Old 09-02-2018, 01:07 PM   #9
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So is it an inspection port? Being that it's on the bottom AND threaded made it appear to be a drain plug.
Here you go. Actually looking at the bell housing there is an o ring but it seems to supplement the rear main seal to keep oil out of the bellhousing.
Anyhow, good luck

Joe
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Old 09-02-2018, 01:59 PM   #10
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I got it, thanks for the insight!
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