Bell housing situation
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Bell housing situation
My 78 f100 4.9L 300 I6 has a notch at the bottom of its bell housing that leaks a very small amount of oil every now and then. I have replaced the oil pan, rod cover and valve cover gaskets and they seem to be holding just fine. The small leak is more of an annoyance than anything but the notch seems incorrect. It also looks man made in my opinion.
Also, there seems to be a bolt missing/broken off on the plate between the oil pan and the bell housing. Its actually above the interesting notch I mentioned earlier.
Is the notch there for any particular reason? And is the absent bolt something I should focus on?
I have posted photos to show what I'm looking at.
Last edited by Notamechanic253; Jun 2, 2018 at 03:06 PM. Reason: Forgot Photos
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The little notch is a vent and drain. In case oil is leaking somewhere inside the housing area, the little slot lets it get out. There is good chance there is a leak near the rear of the engine or the crankshaft seal is leaking inside the housing.
The missing bolt looks like and inspection cover bolt to me. This is not a structural bolt. You can try putting a new bolt in the hole... if the old one is broken off inside it will be no go. I would just leave it until you pull the housing some day and then fix it or have a machine shop fix it. .
The missing bolt looks like and inspection cover bolt to me. This is not a structural bolt. You can try putting a new bolt in the hole... if the old one is broken off inside it will be no go. I would just leave it until you pull the housing some day and then fix it or have a machine shop fix it. .
Grumpy goat
Joined: May 2017
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I don't think its rear main seal. You'd have oil on the forward side of engine plate also. If it's coming out of the bell housing weep hole, it's most likely the transmission input shaft seal. Very easy and cheap fix....once the engine is separated from the transmission. Is that a T-18 or NP435 transmission?
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To be honest, I'm not sure. My vin# lists my transmission as a C6.
After reading a little bit about the T-18 and the NP435 transmissions, I'd say the C6 in my F100 custom inline 6 more closely relates to the NP435 in terms of workload
After reading a little bit about the T-18 and the NP435 transmissions, I'd say the C6 in my F100 custom inline 6 more closely relates to the NP435 in terms of workload
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Grumpy goat
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I'm confused. C6 is an automatic. I see a clutch fork, linkage, and clutch pedal return spring. It is a manual transmission, is it not?
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Ford Parts Specialist
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From: Simi Valley, CA
1978 F100 300 I-6: TRANS code: A = New Process 435 4 speed // B = RUG SR-OD Single Rail 4 speed overdrive / C = Ford type 3.03 3 speed // F = Warner T-18 4 speed // G = Automatic Transmission.
Thru 1978, the IDIOTS at FoMoCo used the G trans code for ALL A/T's. One had to know which trans was available with what engine.
C6 is an A/T, the converter housing is made as part of the trans case. Your truck has a bell housing and I can see clutch linkage, so it has a manual trans.
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You guys are right, it doesnt list the transmission on the vin number. I apologize for the confusion. Im an idiot. I was looking at the warranty number.
Yes, it is a 3 speed. I just got out from under it looking for any kind of identification number with no luck. Again, I'm sorry about the confusion
Yes, it is a 3 speed. I just got out from under it looking for any kind of identification number with no luck. Again, I'm sorry about the confusion
Ford Parts Specialist
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From: Simi Valley, CA
This is the original Owners Card, usually found in the glove box. It's not the Warranty Plate, as it's riveted to the left door face below the latch.
If C is the TRANS code, your truck has the Ford type 3.03 3 speed manual all synchromesh transmission, shift lever is on the column.
If C is the TRANS code, your truck has the Ford type 3.03 3 speed manual all synchromesh transmission, shift lever is on the column.