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CATEGORY LISTINGS > DETROIT > bull gear [ REFRESH ]
Thread Title:

bull gear


Created On Monday June 02, 2014 15:09 Diesel Talk
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littlejohn
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Note Monday June 02, 2014 15:09 View users profile View thread in raw text format
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my truck has almost 2 million miles, so when do you need to do the bull gear is it by age, milage, noise, or it there a test you can do?
and can a bull gear be done by a back yard kind of a guy or this need to be done in shop? is there any special kind of tools I need ?
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egantrucking
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Note Tuesday June 03, 2014 14:05 View thread in raw text format
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2 million :-o

Has she been overhauled? What else have you done to it? Injectors? how long have you owned it? if you don't mind sharing....

I posted my experience on replacing the bullgear. I am by no means an experienced mechanic, but I have been working on motors since I was a child. There are some other people that posted about replacing the bull gear which was great help to me! You do need a few tools, but you can get by without any expensive stuff.

You need to take off an inspection plate and use a pry bar to check for play. Be gentle but firm. Flex is ok but not play. The bearing is just like a wheel bearing. Two tapered bearings. If you know what those should and should not feel like. Bar the engine over (rotate it) and check for play in different positions. The race could be failing in only one spot, to start. Examine the teeth. Any metal on the magnetic drain plug? Do you do oil samples?

I would think it has already been replaced from what I hear people say about them. 2 million would be a lot if it's original.

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michael egan
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egantrucking
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Note Tuesday June 03, 2014 14:07 View thread in raw text format
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I don't see how to search on here, or I would bump my old post, to if it would help you.

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michael egan
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beachguy
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Note Thursday June 05, 2014 08:46 View thread in raw text format
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What would you look for in oil sample regarding bull gear?

Edited: Thursday June 05, 2014 at 08:51 by beachguy
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ponway
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Note Thursday June 05, 2014 20:54 View thread in raw text format
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<< I don't see how to search on here, or I would bump my old post, to if it would help you. >>



Egan, is this the one your thinking of? http://www.dieselenginetrader.com/diesel_talk/messageview.cfm?catid=9&threadid=4162

And here is my limited experience with the bullgear, I am not a trained Detroit tech, just a owner.operator who does all his own work. Over 400,000 mi on this job and doing fine. About half way down, you may find some useful info in my update. Good luck and do buy a manual!

http://www.dieselenginetrader.com/EngineTraders/diesel_talk/messageview.cfm?catid=9&threadid=4277

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Wayne Pontius
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heavyhaulerss
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Note Thursday June 05, 2014 23:11 View users profile View thread in raw text format
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I don't see how the truck went to almost 2 mil with the original bull gear, with out some prior work.

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HEAVYHAULERSS
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egantrucking
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Note Sunday June 08, 2014 19:57 View thread in raw text format
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If the bearing was bad, I would expect the wear metal "iron" to be higher in an oil sample because the gears would not stay true when rotating. Just my guess.

I know for years, I would always have a few shinny pieces of glitter like metal on my magnetic oil plug, when I did oil changes. I just accepted it as normal. One oil change there was a lot of metal on the plug, that is when I looked for a problem and discovered that the bull gear bearing was bad. After a new rebuild bull gear, there is never any metal on the drain plug. Nothing. Perfectly clean.

I do not do regular oil samples. Just an occasional one from time to time.

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michael egan
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danofarming
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Note Thursday January 22, 2015 14:34 View thread in raw text format
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Pull the Accessory drive on the right front of your engine. You will see the tooth edge of the Bull Gear, reach in with a large screwdriver and check the Bull Gear for forward to rearward movement. if it moves any at all it needs to be replaced. If no motion run it!
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