Chrysler is paying to install a new cam (2005/2006 owners should read this) - Page 41 - JeepForum.com

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post #601 of 1818 Old 08-19-2010, 04:17 PM
bonza
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Quote:
Originally Posted by Savage1969 View Post
FYI, according to NAPA, these are the specs on the DG402:

# Distributor Drive Gear Teeth : 13 Teeth
Distributor Gear & Pin I.D. : 0.5324"- 0.5332"
Distributor Gear & Pin O.D. : 1.03"
Distributor Gear Height : 1.031"
Distributor Gear Pitch Direction : Right Hand

It appears to have about the same hole placement as the Crown gear, correct me if I'm wrong here.
I agree it does seem to have the same hole placement as the Crown gear

just measured the Crown gear with a micrometer and it is:-

Gear ID: 0.532"
Gear OD: 1.020"
Overall Gear Height: 1.249" this is a lot different as specified by the NAPA gear. I think the NAPA dimension is a mistake
Gear Teeth Height: 0.772"
Gear Direction: RH
Number of Teeth: 13
The OD is concentric to the ID by less than 0.001" and it has been hardened.
going to do a hardness check, hopefully today and will post what it is in Rockwell


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— Winston Churchill..
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post #602 of 1818 Old 08-19-2010, 07:19 PM
bonza
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for the Crown gear
did the hardness test using an Le testing machine
the gear being small was a bit difficult to test, but got a few good readings off the face of the pinion

for comparison purposes did the conversion from Le to Brinell Hb scale with standard ball

mild steel typically at most: 144 Hb
Crown Gear: 231 Hb, about 21 Rockwell c

so at it is hardened, but it is not particularly hard, but then again if it is well lubricated and to dimensional spec and there is no real restance to its rotational action, it doesnt have to be

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post #603 of 1818 Old 08-19-2010, 07:37 PM
DstroyrOfWrldz
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wait, didn't the stock gear come out at 27Rc? So this one is softer than the stock gear?

Joe
2005 Wrangler Unlimited (Sold)
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post #604 of 1818 Old 08-19-2010, 07:42 PM
bonza
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Quote:
Originally Posted by DstroyrOfWrldz View Post
wait, didn't the stock gear come out at 27Rc? So this one is softer than the stock gear?
I dont know where that hardness came from, maybe that was the hardness of the cam shaft gear. In my experience the driving gear in most cases is harder than the driven gear so 27 cam gear to 21 distributor gear may be ok

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post #605 of 1818 Old 08-19-2010, 08:03 PM
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Quote:
Originally Posted by bonza View Post
I dont know where that hardness came from, maybe that was the hardness of the cam shaft gear. In my experience the driving gear in most cases is harder than the driven gear so 27 cam gear to 21 distributor gear may be ok
That is also my experience for what it's worth. My industry deals with ultra-high pressure water pumps and accessories. All our drive gears are equal to or harder than the driven gear.

I should have the NAPA gear in hand by this weekend. I truly expect it to be exactly the same as the Crown gear though, my guess is it's the same source manufacturer.

Last edited by Savage1969; 08-23-2010 at 11:35 AM. Reason: clarify drive vs. driven
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post #606 of 1818 Old 08-20-2010, 06:39 AM
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The first thing that jumped out at me is the 0.010" difference in OD of the gears. I wonder if that 5 thousandths difference is enough to push the gear mesh over the edge.
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post #607 of 1818 Old 08-20-2010, 09:16 AM
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FYI - I sent Crown Automotive inquiring about the source of their gears since there was no origination information with the part.

I also sent him a link to this thread and suggested that his company may want to investigate this issue and look into creating a new drop in replacement gear for us. Perhaps others might want to send him an email as well. If we can show the demand, I don't see why they wouldn't look into relocating the hole and making sure everything matches up for our application.

Here was their response...

-------------

Hi this part is not made in China it is made in Spain where most
quality gears come from.

Thanks

Mark Consiglio
National Sales Manager
Crown Automotive Sales Co. Inc.,
781-319-three one zero zero
mark 'at' crownautomotive 'dot' net

--------------

Last edited by speed_phreak; 08-20-2010 at 11:02 AM. Reason: Changed contact information to not throw this guy under the buss with the SPAMBOTS!
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post #608 of 1818 Old 08-20-2010, 06:31 PM
bonza
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Quote:
Originally Posted by Sweeney View Post
The first thing that jumped out at me is the 0.010" difference in OD of the gears. I wonder if that 5 thousandths difference is enough to push the gear mesh over the edge.
shouldnt. by rights there should be a fair bit of clearance between the root and tips of gears.

what makes a difference is the tooth thickness. I was going to measure that, but my small gear tooth caliper has been "borrowed". will measure it early next week and work out what "DP" or "module" gear profile it is. from there I can work out what OD it should be and what tooth thickness it should be, then will report back

glad they are made in Spain. the Spanish have a lot of good mechanical industry expertise

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post #609 of 1818 Old 08-20-2010, 11:55 PM
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Well, I just got the wonderful news from my dad in the states. The jeep just destroyed ANOTHER cam gear and it took the cam out with it this time. Awesome My dad is not up to the task of pulling the head and swapping cams by himself. I guess it'll just get parked for a LONG time until I get back to the states

'98 Sahara w/AX15 & 4.6L stroker, 2.5" OME lift, 32" BFG M/T's, 8.8 w/Detroit Trutracs & 4.10's F&R
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post #610 of 1818 Old 08-21-2010, 12:06 AM
bonza
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Quote:
Originally Posted by SkylinesSuck View Post
Well, I just got the wonderful news from my dad in the states. The jeep just destroyed ANOTHER cam gear and it took the cam out with it this time. Awesome My dad is not up to the task of pulling the head and swapping cams by himself. I guess it'll just get parked for a LONG time until I get back to the states
so, you are talking about about a '98 Wrangler?

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post #611 of 1818 Old 08-21-2010, 12:45 AM
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Clarify your statement.
Quote:
Originally Posted by Savage1969 View Post
That is also my experience for what it's worth. My industry deals with ultra-high pressure water pumps and accessories. All driven gears are equal or harder than the driven gear.

I should have the NAPA gear in hand by this weekend. I truly expect it to be exactly the same as the Crown gear though, my guess is it's the same source manufacturer.
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post #612 of 1818 Old 08-21-2010, 01:37 AM
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Yes I am. The cam/dizzy gear contact is no different between the years. I also run a stroker with an aftermarket cam, high volume oil pump, and have chewed up 4 different gears over 2 different motors and 3 cams. There's lots of factors. It's not only the year it was made.

'98 Sahara w/AX15 & 4.6L stroker, 2.5" OME lift, 32" BFG M/T's, 8.8 w/Detroit Trutracs & 4.10's F&R
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post #613 of 1818 Old 08-23-2010, 09:27 AM
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Hesco Inc. - High Performance Engine Service

Might check this out if it hasn't already been posted.
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post #614 of 1818 Old 08-23-2010, 09:44 AM
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Quote:
Originally Posted by Peterpsc View Post
Hesco Inc. - High Performance Engine Service

Might check this out if it hasn't already been posted.
NICE!!!!
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post #615 of 1818 Old 08-23-2010, 10:23 AM
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Quote:
Originally Posted by Peterpsc View Post
Hesco Inc. - High Performance Engine Service

Might check this out if it hasn't already been posted.
Interesting, that would imply the swap to Delo oil or the additives could be a cure. Could just be a good copy writer too... I'd like to have the facts.
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