 Testing a four MPS, one holds vacuum but it's erratic |
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| Mark Henry |
 Feb 18 2021, 01:56 PM
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that's what I do!  Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada  |
Hi All!
Ethan just tested four MPS on a '74 2.0 we have here and it seems one holds pressure but it runs erratic. We tested the three other MPS and they tested good. I know that even if an MPS tests good, old MPS's the diaphragm's often fail once pressed back into service. Would the Tangerine MPS diaphragm kit help this, or is there something else likely going on? |
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| mgphoto |
Feb 20 2021, 01:46 PM
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"If there is a mistake it will find me" Group: Members Posts: 1,363 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
I’ve rebuilt about a half dozen using Racer Chris’ kits. Very simple, you will need an induction meter to set up the basics with fine tuning done using an o2 meter.
Factory manual gives the values for the two coils resistance, if the coils are bad dump it. FYI 1.7 and 2.0 difference is a spacer ring in the 2.0. Also if you radius the edge of the ring the where it contacts diaphragm it will flex better and last much longer. |
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Posts in this topic
Mark Henry Testing a four MPS Feb 18 2021, 01:56 PM
JeffBowlsby
Hi All!
Ethan just tested four MPS on a ... Feb 18 2021, 03:11 PM Mark Henry Thanks Jeff, I see Chris' kit also has a coupl... Feb 18 2021, 03:23 PM
DRPHIL914
Thanks Jeff, I see Chris' kit also has a coup... Feb 18 2021, 04:10 PM Mark Henry Thanks Feb 18 2021, 04:22 PM MikeM Mark...I have one that has failed electrically. Th... Feb 19 2021, 11:20 AM Mark Henry Thanks, yes I figured as much.
The one that's... Feb 20 2021, 12:45 PM 914_teener I had one that was partially cracked.
Would opera... Feb 20 2021, 10:44 PM warpig Had a similar prob. Rebuilt MPS and would run erra... Feb 21 2021, 12:20 PM r_towle Order kit (s)
Wait for arrival
Then open MPs Feb 21 2021, 06:25 PM |
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