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Author Topic: Pinion tooth count MCI 8V-71 starter? Fixed!  (Read 781 times)
bevans6
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« on: September 19, 2013, 09:54:09 AM »

I am about to order a starter but need to verify the tooth count for the pinion.  I think it's 11 tooth, is that correct?

Brian
« Last Edit: September 20, 2013, 05:06:03 AM by bevans6 » Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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bevans6
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« Reply #1 on: September 19, 2013, 01:52:39 PM »

It is 11 tooth, thanks "Luke at US Coach" !   Cheesy  I'm going to try moving the copper disc in the solenoid tomorrow morning.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
5B Steve
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« Reply #2 on: September 19, 2013, 02:49:39 PM »

Brian I sent you a PM.

Steve 5B....
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wg4t50
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« Reply #3 on: September 19, 2013, 03:37:11 PM »

Generally Both Cummins & DDC ARE 11 tooth, Cat is 12 tooth.
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bevans6
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« Reply #4 on: September 19, 2013, 03:59:43 PM »

Thanks, guys, I appreciate the help!  I'll let you know tomorrow if Luke' s idea to check the copper plate in the solenoid helped or not.  Issue is the starter is cutting out, and kind of stutters as it turns the engine over.  It's warm, the batteries are good, the wiring is new, the starter is getting worse.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
Chopper Scott
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« Reply #5 on: September 19, 2013, 05:40:37 PM »

I found out after 2 rebuilt starters that it was the fuel pressure switch on my filters that was causing the problem.  Basically it grounds out under pressure and enables you to push the start button to bypass the shutdown feature on the bus. Just check that out first. Mine did the same and I spent a lot of money until I figured it out.  Ground the sensor out on the filter housing and see if that helps.
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bevans6
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« Reply #6 on: September 20, 2013, 05:09:27 AM »

Scott wins the prize for the fix!  I feel so stupid...  I can't count the number of times I've advised others to check that cut-out switch, and totally forgot to check mine.  It was cutting out and making the starter "stutter".  Same symptom as too little battery, sticking solenoid, worn out starter motor, but at a cost of $0.10 for a new connector on the end of the wire and bolting to chassis ground a far cheaper fix.

Now - do most replace the switch or leave the bypass in place?  Mine is a normally closed switch that provides ground to the starter relay coil, and opens when there is fuel pressure so you can't engage the starter when the engine is running.

Brian
« Last Edit: September 20, 2013, 05:11:56 AM by bevans6 » Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
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« Reply #7 on: September 20, 2013, 06:23:01 AM »

Since you are the only driver, it's your call.  It was originally there as an anti-idiot device.
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« Reply #8 on: September 20, 2013, 07:13:29 AM »

No fuel pressure switch on mine.

JC
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TomC
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« Reply #9 on: September 21, 2013, 07:25:28 AM »

Take the fuel pressure switch off-just another thing to go wrong. I'm sure you're smarter then to grind the starter after the engine is started. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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