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mstrcrftr 
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Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
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 Posted: Aug/16/2022 at 8:28pm |
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if you have an aftermarket timing cover, that is most likely where your problem is. as mentioned above, the slot in the timing gear is crucial.
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BassBoat
AMC Addicted 
Joined: Aug/29/2008 Status: Offline Points: 1719 |
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Posted: Aug/17/2022 at 7:49pm |
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I had a failure due to egregious deep slots on the timing sprocket that bled off all the oil that was supposed to lube the distributor drive gears. So even with a good timing cover and good gears you can still have a problem if the timing chain sprocket is defective. Slots on an original sprocket were about 030 deep, the one on my 304 they were maybe 100 deep.
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DragRacingSpirit
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Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Posted: Aug/23/2022 at 7:01pm |
With all that metal going through it you might be lucky to still have 30 pounds.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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waltl
AMC Apprentice 
Joined: Sep/07/2012 Location: illinois Status: Offline Points: 131 |
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Posted: Aug/31/2022 at 2:42pm |
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I think this is where Bulltear gets his covers.
They have been recommended to me by a reputable machine shop that does a lot of AMC engines. |
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Walt L.
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DragRacingSpirit
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Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Posted: Aug/31/2022 at 3:15pm |
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You want a good used OEM if you can get one as was posted earlier in this chain. A new aftermarket should be your absolute last choice.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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BBO UK
AMC Nut
Joined: Feb/17/2020 Location: UK Status: Offline Points: 288 |
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Posted: Aug/31/2022 at 3:45pm |
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Original covers work, many of the new castings don`t, I think Bulltear still check theirs on a jig and therefore only sell correct ones, but I think they had a high "return to manufacturer" number. Best look for an original if possible, I found one recently, dismantled from an `80`s jeep, sitting on a shelf at a parts wherehouse for 35years.
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keiths 70 AMX
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Joined: Jul/30/2016 Location: Mich Status: Offline Points: 117 |
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Posted: Sep/03/2022 at 12:11pm |
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I have a timing cover I removed from a AMC 1976 360 engine. How can I tell if it's an original AMC
cover?
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1970 360 AMX
1980 Spirit DL IN GOD WE TRUST |
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74Bubblefender
AMC Addicted
Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
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Posted: Sep/19/2022 at 1:08pm |
 Silver seal is who ruined AMC timing covers by getting a bad taiwanese one repopped in china. Definitely where Bulltear does not get covers |
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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
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DragRacingSpirit
AMC Addicted
Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Posted: Sep/19/2022 at 3:36pm |
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On my first race motor about 17 years ago, I had a complete chrome plated Bulltear cover bought as a complete assembly. Of course it did not come with the cam/distributor gears or the timing chain set that I used. This motor I built was a dist/cam gear eating machine. On this motor I ended up having to go to a bronze distributor gear which I had to change out many times. Along with the oil and filter more than should have been necessary. I am not saying it was the timing cover. It could have been a combination of differing parts. It had to be 1 or more of the following. Timing cover, pump gears, milodon end plate and dual line pickup, timing gears , the dist/cam gear themselves, end clearances ?????? It could very well have been operator error on assembly and something I overlooked. The end play clearances were set to a nominal .002-.003 by my memory and the oiling slot in the timing gears were proper. I even went so far as to install an external oiler for the dist/cam gears and then an Alfono timing set W/thrust plate to rule out cam walk, all to no avail. The oil pump itself was fairly stiff to turn. I never did try opening the end clearances to a higher figure and I should have tried the oil gears with the pressure relief cuts on them. I never did figure out the root cause. The engine bearings were in perfect condition when I tore it down and it had great oil pressure. 15 pounds at idle and 80 or so crossing the finish line at 7500. When I built my newer iron motor I went to an Indy cover w/razor oil pump, Milodon gear drive and have never had a problem since. The bottom line is unless you are working with proven components you don't know what you will end up with until you try it out ?
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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