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Minneapolis Moline Tractors Discussion Forum
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MM Jet Star 3 Super

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Walkinfuss

09-18-2023 16:08:22




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Can use some more help. The original MM volt meter does not work. I replaced it with a new meter, however the new meter will not allow the engine to crank or star when I jump the starter. Tried a second new meter the same. Put the original meter back in and it starts every time, just no meter operation.
When I ohm the old meter out, its a complete circuit. The new meters are open? The new meters read the voltage when I turn the key, just will not allow the motor to turn over of start???
Tried reversing polarity with no success? Both are new Bosch gauges. Any ideas? Thanks

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Walkinfuss

09-27-2023 16:31:32




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
Will do. Didn't think of end play. Someone was in the motor before, the pistons are .040 over and the crank rod journals miced .020 under size. Didn't want to split the tractor, guess I may have to anyway.
Thanks again



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Walkinfuss

09-27-2023 16:09:46




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
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Relief valve and spring are in great shape, Gets worse now... Took off shims to achieve less gap. Started up, still no oil pressure, then completely stops. Distributor rotor not turning took out the pump drive shaft.... a lot of elbow grease to drift the shaft up and out. ... got it out, the drive gear pin was sheared off an the gear was pushed away from the cam drive gear. The oil pump drive gear was shattered. Cam drive gear looks good. Looks like the distributor shaft is bent, wobbles when its in my end mill. Shaft is pretty scared up. I have another pump drive gear, gona have to either straighten the shaft or have one made... will keep posted my progress.. Thanks for the in-put.

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molinegb

09-27-2023 16:23:57




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-27-2023 16:09:46  
I would check endplay of crankshaft. Too much endplay may be damaging governor on end of crankshaft. Can inturn be causing cam to float forward hitting oil pump shaft. No reason for gears to pile up in pump unless somehow chunk of steel got into it. Same oil pump gears used back in TC days of 12-20 etc. All MM had ammeter and never voltmeter. To me sound like motor need rebuild especially bottom end.

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MMDEL

09-27-2023 08:43:36




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
have you checked the relief valve and spring???? Even with those clearances you should have some pressure. With cold oil. Dose the drive gear rotate when you crank it over with the starter?? Blow out the oil passage from the pump to the pickup screen.

MMDEL



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Walkinfuss

09-26-2023 07:01:45




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
Thanks, I knew that at one time.... I seem to forget how bad my memory is.
On another note, concerning the oil pump spacing between the engine and oil pump surfaces. .002-.004 spacing is the target and can be achieved by shim/gasket thickness combinations.
My conundrum is this. When I lay a flat edge across the pump idler and drive gears to measure the gap using feeler gauge, the side with the idler is level (no gap) with the pump housing, while the drive gear is .015" from that side of the pump housing. I compiled gasket shims to a collective thickness of .018". I have ZERO oil pressure regardless of how the pump pressure is adjusted. Is it a standard practice to mill/surface grind both the drive and idler gears to the same length? Using plastic gauge to measure the clearance would seem useless with the gears not being the same elevation above the pump housing.
I am so close to wrapping up the project!!

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sms

09-20-2023 14:32:23




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
Ammeter is connected in series, voltmeter is connected parallel.



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molinegb

09-19-2023 07:05:54




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
As with all gauges a difference potential is required for meter movement. More positive than negative or vice versa. Can easily be checked with a battery charger or power supply.



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ChrisQ

09-18-2023 20:53:50




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 Re: MM Jet Star 3 Super in reply to Walkinfuss, 09-18-2023 16:08:22  
The original gauge is an amp meter. Volt meter gauge is different. A volt gauge just measures voltage. Amp gauge measures the current flowing through it.



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Walkinfuss

09-19-2023 04:14:40




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 Re: MM Jet Star 3 Super in reply to ChrisQ, 09-18-2023 20:53:50  
Thanks



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