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Tiger Joe 
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Joined: 12 Aug 2012
Location: Pittsburgh
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 Topic: hd7gb oil pan
Posted: 12 Aug 2012 at 9:43am |
Hey guys, new here, my dad just picked up this machine:
I think its a 7gb, but im not sure how to tell the difference between a 7g and a 7gb? It has the 6 cylinder tubro diesel engine.
As soon as we got it home we noticed an oil leak. Climbed under and saw someone had patched the oil pan, poorly. WE decided to take it off and repair, but cant get it off. We pulled all the bolts from the pan, but its like its still held on somehow. Anyone have any idea how to get it off?
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 29548
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Posted: 12 Aug 2012 at 12:25pm |
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It is a 7GB, the 7G(I have one) has two upper rail rollers and a four cylinder diesel. Can't help with the pan but if it is exposed someone removed the skid pan from under it and that is why it was holed the first time. You may want to invest in a service manual(ebay is a likely look) and a parts guide for your series, I did for mine and not regretted that move yet.
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gemdozer
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Joined: 17 Sep 2009
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Posted: 13 Aug 2012 at 5:31am |
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The ALLIS CHALMERS HD7GB has a 3500 motor in
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Tiger Joe
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Posted: 13 Aug 2012 at 10:49am |
Ya thats what I've figured out so far.
its a 7gb and has the 3500 6 cylinder tubro diesel.
But I still dont know how to get the oil pan off
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gemdozer
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Posted: 13 Aug 2012 at 12:23pm |
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If your pan bolts are all removed you need to knock on with a hammer she must be stock with the gasket
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Tiger Joe
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Posted: 13 Aug 2012 at 2:23pm |
ok Im not near the machine right now, but we took all the pan bolts out going up into the engine. (if you are laying under the machine)
What about the bolts between the oil pan and trans- facing toward rear of machine- do those need to come out too? almost look like oil pan goes up over that cover on front of trans
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gemdozer
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Posted: 13 Aug 2012 at 3:36pm |
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I dismantled 2 ALLIS CHALMERS 7GB for parts but I do't remember about these bolts but the 7g the 5 bolts pan who are bolting on housing transmission have to be removed
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Tiger Joe
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Posted: 13 Aug 2012 at 3:49pm |
ok when we tried to pull the one, trans fluid was pouring out, why we stopped.
Im going to go out and look and it now, and snap some pics for you to check out from underneath
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Tiger Joe
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Posted: 13 Aug 2012 at 7:52pm |
alright here are some pics from under the machine...
Front- 6 bolt holes, 6 bolts removed:
Both sides, 11 bolt holes I believe per side:
Rear-
I removed those 5 bolts that go into the trans, bunch of trans fluid ran out, but the pan will not budge. I got a long rod and hit the lip of the pan from the top. Nothing, it actually dented the pan slightly but didnt crack the seal.
Am I missing any bolts? or is this thing just stuck on there that tight
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gemdozer
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Posted: 14 Aug 2012 at 5:25am |
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I think the lipp have to be removed and sometime we need a piece off wood 4x4 and sleedge hammer and knok on pan ,the woner should have use some glue on gasket
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Tiger Joe
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Posted: 14 Aug 2012 at 9:29am |
Ya the previous owner told my dad they rebuilt the engine- thats why the belly pan was off of it, they never put it back on.
What lip do I have to remove? you mean that thing in the back with the 5 bolts?
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gemdozer
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Posted: 14 Aug 2012 at 12:01pm |
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Yes the lip with 5 bolts and in picture she look like welded.
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Tiger Joe
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Posted: 14 Aug 2012 at 3:30pm |
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hmm, i dunno most of that goop was just silicone
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Steve allis dozer
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Posted: 15 Aug 2012 at 4:08am |
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you will have to drain the trans oil and take out the bolts also check if there are any at the front of the pan horizontal , I recommend never operate this machine without all the belly guards on
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D-17_Dave
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Posted: 15 Aug 2012 at 7:24am |
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Silicone can form a really tight bond when used on a ll 4 sides, use a wooden block and a good sized hammer on the side of the pan near a turn at the bottom. Several good HARD wacks should start to peel it loose. If you ever get it started you can insert a small pry bar in the gasket bolt flange and pry it down.
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Yea, I can fix that.....
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Tiger Joe
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Posted: 15 Aug 2012 at 1:52pm |
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Thanks for the replies guys. Probably wont get out to look at it again until saturday. Going to try checking for bolts up front and try to block + hammer.
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