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Cummins MVT setup

Posted By rpoore Sunday, September 09, 2018 7:43 AM
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rpoore
 Posted Sunday, September 09, 2018 7:43 AM
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So I recently just bought a 1966 351 that’s powered by a BC2 475. So the previous owner told me the engine was tired and smoked really bad. After looking at it I figured the solenoid was not working on the MVT. This MVT has the oil lines feeding to it, my question is does anyone have a layout of where the oil lines should come and go to? When I put 90 psi of air to the Acuator it won’t lift up, the way the oil lines are now looks like it would be feeding oil pressure to the solenoid, the side of the housing and to the vent at the top. I’m really interested in getting it working right it’s a cool idea, but i can’t seem to find anything out there about how to actually set one up. Thank you
jimfols
 Posted Sunday, September 09, 2018 2:27 PM
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Before the oil lines came on the scene, the moisture in the air system caused big problems with the orings and inner workings of the MVT cylinder. The oil lines are to keep a slight mist of oil in the cylinder to prevent the moisture from causing problems.
The first thing is to get ones mind around the fact that the oil does not control the cylinder.
I understand most believe this is the case but it is simply not true.
The cylinder is controlled by the air pressure.

The cylinder may not move without the engine running or being barred over.
If the cylinder is definitely stuck take the top cap off and look inside.

If it needs to come apart count or measure the threads above the lock nut and mark the adjusting screw position. That way it can be put back exactly the same to maintain the injector timing.

The first problem to solve is to get it moving.


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Jim
Newto
 Posted Monday, September 10, 2018 12:22 PM
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Last Active: 2 days ago @ 8:37 AM
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Firstly,everything that Jim said is correct.

You said you put 90psi to the actuator.....did you also energise the solenoid with 12v???

Like Jim said take the top cap off so you can see inside and the piston.Then energise & put shop air to the actuator and try barring the engine over manually while someone watches the piston.

If its stuck it should at least try to move....or if the o ring on the piston is shot you will here air escaping.

I have a MVT Bulletin book I can try photocopying & pm to you but the black and white pics probably won't be clear but the text might help.

A schematic is attached....might help if you need to pull apart.

cheers,

Newto
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Newto
 Posted Monday, September 10, 2018 12:31 PM
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tried this to see how the diagrams came out.

Newto
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rpoore
 Posted Thursday, December 13, 2018 4:30 PM
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Last Active: Thursday, December 20, 2018 4:16 PM
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Thank you for the help! So I figured out the way the solenoid was wired it was only getting 6 volts instead of 12. Got it rewired and it runs perfect now
Newto
 Posted Saturday, December 15, 2018 9:35 AM
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Good stuff!!

Glad to see you got it sorted without a major operation!

Newto
4bangor
 Posted Monday, December 17, 2018 1:19 PM
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