Chrysler is paying to install a new cam (2005/2006 owners should read this) - Page 41 - JeepForum.com
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Unread 08-19-2010, 05:17 PM   #601
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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Unread 08-19-2010, 08:19 PM   #602
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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Unread 08-19-2010, 08:37 PM   #603
DstroyrOfWrldz
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wait, didn't the stock gear come out at 27Rc? So this one is softer than the stock gear?
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Unread 08-19-2010, 08:42 PM   #604
bonza
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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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Unread 08-19-2010, 09:03 PM   #605
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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 12:35 PM.. Reason: clarify drive vs. driven
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Unread 08-20-2010, 07:39 AM   #606
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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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Unread 08-20-2010, 10:16 AM   #607
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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 12:02 PM.. Reason: Changed contact information to not throw this guy under the buss with the SPAMBOTS!
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Unread 08-20-2010, 07:31 PM   #608
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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Unread 08-21-2010, 12:55 AM   #609
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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
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Unread 08-21-2010, 01:06 AM   #610
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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Unread 08-21-2010, 01:45 AM   #611
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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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Unread 08-21-2010, 02:37 AM   #612
SkylinesSuck
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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.
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Unread 08-23-2010, 10:27 AM   #613
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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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Unread 08-23-2010, 10:44 AM   #614
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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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Unread 08-23-2010, 11:23 AM   #615
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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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2006 , 4.0 , camshaft , replacement , tj , warranty , wrangler

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