Your donations help keep this valuable resource free and growing. Thank you.
|
Distributor |
Post Reply | Page <1234> |
Author | ||
purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16585 |
Post Options
Thanks(0)
|
|
|
||
ChillyB
AMC Nut Joined: Nov/14/2018 Location: PA Status: Offline Points: 371 |
Post Options
Thanks(0)
|
|
I'd think a stumble just as the throttle is applied is more likely acellerator pump than power valve? But both are possible, and agree that a backfire can easily pop a MC2100 valve. If carb hasnt been rebuilt in recent memory then do that. Acellerator pump rubber gets stiff and develops pin holes. Power valves are vulnerable to backfire.
|
||
V8Mart
AMC Apprentice Joined: Mar/10/2019 Location: UK Status: Offline Points: 41 |
Post Options
Thanks(0)
|
|
I would like to remind all posters that my carb is virtually brand new...distributor looks very worn, cant find any suitable rebuild kits so will get a new or rebuilt distributor
|
||
that is all
|
||
purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16585 |
Post Options
Thanks(0)
|
|
|
||
V8Mart
AMC Apprentice Joined: Mar/10/2019 Location: UK Status: Offline Points: 41 |
Post Options
Thanks(0)
|
|
how do I know if power valve is bad, Had the carb apart to clean and all looks fine
|
||
that is all
|
||
mrblatzman
AMC Addicted Joined: Oct/01/2008 Location: Alabama CSA Status: Offline Points: 2153 |
Post Options
Thanks(0)
|
|
I have a good used distributor that I have had in storage for some time now...The number lists it as fitting a 1972 304 engine...Its dirty, complete with out cap, but should clean up and be fine...I ran across it while getting stuff ready for Saint Louis...I priced it at $35.00 if you or anyone else needs/can make use of it...I would install a new vacuum advance just as a routine thing...Bob in Fort Payne Alabama
|
||
Thankyou....Bob
|
||
ChillyB
AMC Nut Joined: Nov/14/2018 Location: PA Status: Offline Points: 371 |
Post Options
Thanks(0)
|
|
Blown power valves continuously pass fuel. You may see it running in the vacuum passages. It'll be wet under the PV's circular steel cover. Seems like you have a lean stumble during acelleration so I'm still suspecting the acellerator pump. Could be an adjustment, or a leaking diaphragm, or a leaking/missing red rubber check valve.
|
||
V8Mart
AMC Apprentice Joined: Mar/10/2019 Location: UK Status: Offline Points: 41 |
Post Options
Thanks(0)
|
|
took power valve cover off and it was full of fuel. Removed power valve and found gasket very soggy and split close to vac port. Valve seems to seat and unseat ok , put new gasket on...vast improvement but still not perfect, still stumbles when mashed very hard from idle but does not die, a gentler approach with the throttle works fine .All looks ok with the acc pump valve and diaphragm, squirts fine, no cracks or splits
Edited by V8Mart - Jul/11/2019 at 9:48am |
||
that is all
|
||
BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1706 |
Post Options
Thanks(0)
|
|
Holley carbs are fussy about the linkage adjustment for the accelerator pump. You may already know the procedure, but if not familiar something you can check. It kinda takes three hands to do it, but basically you hold the throttle wide open, then push on the pump arm (a small open end wrench is handy for this) to the max travel and then measure or set the clearance between the pump arm and the spring end of the arm that rides on the pump cam should be 0.015 inch. When I read those instructions I admit it is confusing, and I have done it many times. If the timing is advanced enough, and the pump linkage is set properly and you still have a stumble, you should try a larger shooter.
|
||
PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5888 |
Post Options
Thanks(0)
|
|
Agree about the Holley Accelerator Pump and proper adjustment.
And if the Idle Speed screw is adjusted much, may have to readjust Accel Pump. And watch out for the Accel Pump Arm that it DOES NOT ride on the shaft mounted wound return spring instead of the plastic Accel Cam. And the Metal Accel Pump Arms can get bent / tweaked out of original shape / contour. Have also seen them "wore out" with a rough ditch worn into them on the cam end. The black plastic Accel Pump Arms may seem kinda hoakey, but at least they can't get bent out of shape!
|
||
Post Reply | Page <1234> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |