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Valve tap on a ca. 1972 Six (232) |
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1967AmericanSW 
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Joined: Feb/10/2008 Location: Arizona Status: Offline Points: 317 |
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 Topic: Valve tap on a ca. 1972 Six (232)Posted: Jun/09/2008 at 11:14pm |
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Question; my 232 Six has developed quite a noticeable valve (lifter) tap at both idle and while driving.....to the point the motor has a definite 'miss'.
I believe the engine is from a 1972 Hornet so am not sure whether it is shaft or pedestal rocker equipped. I still have my 1967 232 longblock that came in my American originally.......if the newer motor has issues, could I used the head, cam and lifters (keeping everything on order, obviously  ) out of the older one?
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purple72Gremlin
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Posted: Jun/10/2008 at 8:46am |
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possibly that the camshaft went flat
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 22772 |
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Posted: Jun/10/2008 at 9:30am |
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I'd suspect the same. Either a very bad rocker, or the cam/lifter is shot.
I guess I don't see issues with swapping of the parts. But if it's a cam/lifter issue, why not just put in a cam/lifter kit? (new)
But I would probably be considering doing the same - using the parts I have since they were "good".
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tyrodtom
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Posted: Jun/10/2008 at 10:18am |
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The 67 head gets oil to the topside thru a hole in the block and are 1.5 shaft rockers. The pedestal rockers get oil to the topside thru the push rods and are 1.6 rockers. Plus the cam specs are different between the two systems. You need to look at your 72 head, pedestal or shaft?
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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1967AmericanSW
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Joined: Feb/10/2008 Location: Arizona Status: Offline Points: 317 |
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Posted: Jun/10/2008 at 11:50pm |
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It gets 'weirder': the engine is quiet when I first start it (cold start that is) but, after a few minutes the lifters start chattering. Checked the oil level, not low and the 'oil pressure' light goes off/stays off once running.
Tomorrow I will throw an oil pressure gauge on and see what happens. |
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poormansMACHINE
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Posted: Jun/11/2008 at 12:41am |
It doesn't take much pressure to turn off the idiot light. Usually about 7 to 10 psi. |
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billd
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Posted: Jun/11/2008 at 9:04am |
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Put a mechanical gauge on. I bet the pressure is barely 10 psi when warm, possibly less, so that could be adding to the issue.
Thanks for the "correction" or clarification, tyrod............
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1967AmericanSW
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Posted: Jun/11/2008 at 1:20pm |
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UPDATE:
Threw a mechanical oil pressure gauge on and the engine puts out 33 PSI at idle..........with the lifters tapping away.
 I am guessing that I need a heavier viscosity of oil.........I have basically 10W-30 in there now, put it in maybe 600 miles ago.
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poormansMACHINE
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Posted: Jun/11/2008 at 5:04pm |
That depends if you're wanting to fix it or cover it up. |
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billd
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Posted: Jun/11/2008 at 8:23pm |
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with 33 at idle, if that gauges is accurate, that's good for a AMC 6, so I doubt heavier oil would do much........
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1967AmericanSW wrote: