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al1630 
AMC Apprentice 
Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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 Topic: 196 IssuesPosted: Jan/19/2020 at 6:15pm |
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Ever since I got my 1963 American driving, the OHV 196 has never seemed to run right. It gets very poor gas mileage and seems to run 'rough'. It has a new head gasket, timing chain, and tune up parts like points etc. I'm running out of ideas and could use some help. I saw a suggestion that it could be a worn out distributor, which I could check with a dwell meter. My 63 TSM says that dwell should be at 31-34 degrees, while mine is about 24 at idle, even though the point gap is set to the book specification. When the engine is revved to 1700 RPM (as shown in the TSM) with vacuum advance unhooked, the angle changes less than 3 degrees (in spec). HOWEVER, when the vacuum advance is connected, the dwell angle drops down to 15 degrees. This doesn't seem normal, or is it? Have I found at least one of the issues? Thanks!
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Alex
1963 Rambler American 440H |
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tyrodtom
AMC Addicted 
Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6214 |
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Posted: Jan/19/2020 at 8:07pm |
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The point plate has a nylon bushing where it pivots.
Is that bushing all there ? Is the pivot pin right ?
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11545 |
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Posted: Jan/19/2020 at 8:18pm |
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That could sure be one of the issues.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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al1630
AMC Apprentice
Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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Posted: Jan/19/2020 at 8:30pm |
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Ok, I'll check that out. Where exactly is it located? I don't really know what to look for.
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Alex
1963 Rambler American 440H |
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purple72Gremlin
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Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Posted: Jan/19/2020 at 8:32pm |
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Sounds like a worn breaker plate. And I suspect the distributor is worn as well
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tomj
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Joined: Jan/27/2010 Location: earth Status: Offline Points: 7555 |
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Posted: Jan/19/2020 at 8:34pm |
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Points gap is a starting point, not the final setting.
Dwell doesn't vary with RPM, more than some tiny mechanical tolerance amount. IF it's varying wildly, something is off. If you have another car running well, maybe clip your dwell meter on it to see if the meter is sensible! Lol, now *that* would make you crazy! Meters, especially inexpensive ones, may vary a with with RPM, but more than 2, 3 degrees would be bad. Take the cap adn rotor off, grab the shaft with two fingers and with decent force try to move the shaft side to side. It will probably have a few thousandths of play, but if it moves much there's something really wrong. It needs to be close tolerance. POints are open what, .017"? or so? for 32 degrees? If the shaft can move .005" dwell will vary, a lot. Try to shift the points sideways, using less force. The breaker plate should rotate, fulcrum is a pin with a clip opposite the vac advance lever, but with stiff resistance, it shouldn't "rattle". It might be work simply pullign it out and completely disassemble it, shaft and all, get a gun barrel brush and really get it clean. CLean out the oil spiral grooves, check the bushing, etc. Lube with light motor oil, it should all turn smoothly and not rattle. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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pacerman
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Joined: Jul/03/2007 Location: United States Status: Offline Points: 9061 |
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Posted: Jan/19/2020 at 8:36pm |
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If you end up needing a distributor, contact me if you want. Joe
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Happiness is making something out of nothing.
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vintage60
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Joined: Aug/21/2017 Location: CT Status: Offline Points: 51 |
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Posted: Jan/19/2020 at 8:46pm |
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All of the above suggestions assume that when the timing chain was replaced it was installed correctly in terms of crank/cam position and the distributor was also installed correctly at #1 TDC. I'm not saying it wasn't but without verifying both you could be chasing your tail for a good long time.
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tomj
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Joined: Jan/27/2010 Location: earth Status: Offline Points: 7555 |
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Posted: Jan/19/2020 at 8:52pm |
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Cay post some pics of it?
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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Heavy 488
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Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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Posted: Jan/19/2020 at 8:54pm |
None of this is going to give erratic dwell
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vintage60 wrote: