DUI drive gear?? - JeepForum.com

 
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post #1 of 8 Old 05-09-2013, 09:30 PM Thread Starter
geneapodaca
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DUI drive gear??

After reading a few posts, I'm seeing that HEI/DUI drive gears are tearing up cam gears. Is this inherent in all HEI type distributors? Do I need to panic or at least stop driving my Jeep till I replace the distributor drive gear? I still have the old distributor so I have parts, but how necessary is it? And, why would a new distributor have a gear that's not compatible with other engine parts? I sent an email to Performance Distributors asking them the same questions but I'm thinking the Jeep forum would know more about our specific engines and issues so I'll consider the responses here more thoroughly. Thanks.

My engine is a fairly new crate 304 with a mild cam.

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post #2 of 8 Old 05-09-2013, 09:34 PM
John N
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The problem isn't with DUI brand HEI distributors. It's mainly with the cheaper HEI's that are using hardened gears.

'81 Scrambler w/ FI 360 AMC, 33x12.50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin sticked w/4:1, Warn XD9000i, etc...
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post #3 of 8 Old 05-09-2013, 10:44 PM
BagusJeep
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JH had the view that DUI were better than the average but why take the risk???

The problem is that the HEI is out of a GM engine that had different specs. As stated by John it is the hardness of the gear that is a concern, if too hard it will eat the softer metal of the cam.

It is a straightforward swap between distributors.

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post #4 of 8 Old 05-10-2013, 05:51 AM
RDH
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I don't see it spelled out clearly so I'll say it now. PUT THE DRIVE GEAR FROM YOUR OLD DISTRIBUTOR ON THE NEW ONE!

1978 CJ7: 304, 3Spd, AMC 20 Rear, Thrush Welded Mufflers W/ Turndowns, Unknown Front, Worn out Dana 20 case
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post #5 of 8 Old 05-10-2013, 06:50 AM
hutch1200
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"And, why would a new distributor have a gear that's not compatible with other engine parts?"
No NEW cam gear is compatible w/an old/used cam gear, already in your engine..
RDH said it best.
Search function "cam/dizzy gear" whoulda told ya that.
Sorry if that sounds harsh..no java yet.

I've also learned that sometimes... when people don't agree with you .... its best to hold them down and kidney punch them till they agree with you
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post #6 of 8 Old 05-10-2013, 08:15 AM
CSP
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Quote:
Originally Posted by BagusJeep View Post
The problem is that the HEI is out of a GM engine that had different specs. As stated by John it is the hardness of the gear that is a concern, if too hard it will eat the softer metal of the cam.
It has nothing to do with the specs of the HEI. These hardened gears aren't the stock HEI gears. The stock HEI gears have the cut going the opposite direction as AMC gears, so they can't be used to begin with.

The problem gears are cheapo AMC V8 gears that are installed on cheapo HEI units made offshore.
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post #7 of 8 Old 05-10-2013, 08:20 AM
Matt1981CJ7
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Has anyone had any issues with the gears that come on the re-man'd Motorcraft distributers?

Thanks,

Matt
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post #8 of 8 Old 05-11-2013, 05:46 AM
RDH
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Depends... Ford had different gear materials for different engines (ie roller vs. mechanical). Regardless, you never EVER put new gears in with old ones. This goes for axle gearing, engine gears (diesels), distributors , etc. After a TON of miles racked up, the gears wear in together making them a matched set. There's no better way to destroy a perfectly good gear and littering your oil system with metal than to install old on new.

1978 CJ7: 304, 3Spd, AMC 20 Rear, Thrush Welded Mufflers W/ Turndowns, Unknown Front, Worn out Dana 20 case
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