MSD distributor taking timing out
#2403085
11/13/17 04:19 PM
11/13/17 04:19 PM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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I have the same issue with my MSD distributor in the 511 that i had with the 408. When i rev the engine 3-4* timing comes out or retards. I fixed the SB issue by adding a crank trigger. Don't want to spend any more money right now and i think i might know why these distributors have this issue. Its not uncommon, just look it up. I believe the oil pump shaft gear is lifting when engine is rev'ed and turning as it lifts causing the timing to retard a bit. How can i stop the oil pump shaft from lifting? Thanks
Last edited by mopar dave; 11/13/17 04:19 PM.
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403125
11/13/17 05:32 PM
11/13/17 05:32 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I would drive out the roll pin & add some flat (non beveled) shims to reduce the axial play to .005" & you may need to in addition add the collar but first lightly twist the rotor back & forth with the dist still installed, not enough to get into the springs & see how much rotational play you have right now (you want very near none). speedway motors has a kit for $10. this may not be the issue for this situation but it is good to address it (it mainly causes spark scatter when timing it on the dampener) & a sloppy timing chain will do the same thing & a sloppy chain will skew cam degreeing readings.
live every 24 hour block of time like it's your last day on earth
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403131
11/13/17 05:44 PM
11/13/17 05:44 PM
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Joined: Dec 2005
Posts: 11,542 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,542
Fulton County, PA
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Someone (Mopar Performance?) sold a shim kit for on the shaft to move it up and minimize end play between the two. I would think timing chain slack, cam twist, timing light electronics not keeping up, etc., would all contribute to this. They all bounce to some degree. All reasons for using a crank trigger.
If the results don't match the theory, change the theory.
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403326
11/14/17 12:34 AM
11/14/17 12:34 AM
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Joined: Dec 2005
Posts: 11,542 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,542
Fulton County, PA
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I think they commonly shim the shaft up to reduce the play between the shaft and the distributor. Adding material to the tang of the distributor shaft and then machining or grinding it up to proper length is another option. Either way, it would have to be tuned with the intake or oil pump off to accurately adjust the end play without having it bind.
If the results don't match the theory, change the theory.
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403371
11/14/17 02:18 AM
11/14/17 02:18 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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set the collar on the end of the shaft reasonably snug then install the dist which will push it up then pull the dist & loctite the setscrew with the collar located at the height that it gets pushed up to.
live every 24 hour block of time like it's your last day on earth
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403592
11/14/17 05:31 PM
11/14/17 05:31 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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So the collar fits on the end of the distributor shaft? Any idea how much clearance is needed? IIRC, the instructions with the collar I bought from Hughes said .006 or .008... not much!
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Re: MSD distributor taking timing out
[Re: mopar dave]
#2403616
11/14/17 06:40 PM
11/14/17 06:40 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Ok. Was gonna see if i could find one at the bolt store. Think ill just order one from Hughes. Any good hardware store will have what you need for less money.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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