MC-1 Bearing Assembly Reassembly

[yjanray]

From what I read in the manuals, when I am putting the bearing assembly back together on my 79 MC-1 drive, there is a spacer between the two bearings. That means that I do not tighten the bolt to 80 ft.lbs? I just tighten it until the bearing starts to move towards the nut?

Does this sound correct...

Thanks

 

[Don S]

Re: MC-1 Bearing Assembly Reassembly

Assuming you are talking about the double bearing in the upper that has the ujoint yoke through it, they all should have the outer (large diameter) spacer, it's the smaller inside spacer that you may or may not have.
If your drive doesn't have the inner spacer, then you use rolling torque, if you do have it you just torque the nut.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

Not sure if it has the inner spacer. I didn't take the bearings apart. I was worried about things I dont know, like pre load.

 

[Don S]

Re: MC-1 Bearing Assembly Reassembly

If you didn't take it apart, then don't mess with it. It's been working since 79.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

If you didn't take it apart, then don't mess with it. It's been working since 79.

Thats exactly why I didn't take the bearings apart. I just don't know if I have the spacer in there, and If I should torque it to 80 foot pounds or tighten it until it begins to move....

 

[Don S]

Re: MC-1 Bearing Assembly Reassembly

I just don't know if I have the spacer in there, and If I should torque it to 80 foot pounds or tighten it until it begins to move....

If you didn't take it apart or loosen it, it's not an issue, and don't mess with it.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

deleted

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

If you didn't take it apart or loosen it, it's not an issue, and don't mess with it.

The bolt in question is the one that holds the entire assembly together, because I had to order a new yoke because my oil seal surface was shot, and my speedi-sleeve endeavor didn't' work out too well....


When I put this assembly back together
and attach it to the new yoke (with new oil carrier)

how do I determine how tight to torque the nut that holds it all together, the nut at the opposite end of the drive splines.

 

[Don S]

Re: MC-1 Bearing Assembly Reassembly

You did take it apart, just not all the way.

how do I determine how tight to torque the nut that holds it all together, the nut at the opposite end of the drive splines.

You don't know without taking it the rest of the way apart and finding out what you have. You also need to inspect the bearings. If you had water in the drive, you could have damaged bearings.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

I honestly wouldn't know what to look for with the bearings. I will say that they roll around in there really smooth, no grinding or roughness at all. I don't think water was in the u-joint area (I.e. a leak in the bellows), as much as water was getting into the drive from the bad seals in the upper, which combined with the bad yoke seal/oil carrier seal, let an oil/water mixture into the u-joint bellows area. There wasn't straight water in the bellows, just the same oil/water mixture that drained from the drive when I started this service project....

 

[ziggy]

Re: MC-1 Bearing Assembly Reassembly

I honestly wouldn't know what to look for with the bearings.

the mercrusier service manual spells it out. i use sm #2, for a '79 i think ya use #4. for my '75 drive
"inspect drive gear for pitting, chipped or broken teeth and excessive or uneven wear. Replace gear if any of these exist. Check tapered roller bearings and bearing cups if cups are pitted, grooved, scored, worn uneven, discolored from overheating or have foreign metal particles embedded in the cup. Inspect oil seal for wear, tears, roughness and proper spring position. if oil seal serviceability is doubtful, replace oil seal. inspect o rings for cuts, nicks hardness and cracks, if o ring serviceability is questionable, replace o rings. replace all damaged shims with new shims of same thickness."

as for if ya got the small spacer.

the smallest of the rounds rings is the small spacer. when ya got the small spacer, ya use a torque value to tighten the drive gear nut.

fwiw. i replaces my brg. set on my drive due to bluing (over heating, one of the criteria for replacment) of the brg. cups. this thread may help too.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

the mercrusier service manual spells it out. i use sm #2, for a '79 i think ya use #4. for my '75 drive
"inspect drive gear for pitting, chipped or broken teeth and excessive or uneven wear. Replace gear if any of these exist. Check tapered roller bearings and bearing cups if cups are pitted, grooved, scored, worn uneven, discolored from overheating or have foreign metal particles embedded in the cup. Inspect oil seal for wear, tears, roughness and proper spring position. if oil seal serviceability is doubtful, replace oil seal. inspect o rings for cuts, nicks hardness and cracks, if o ring serviceability is questionable, replace o rings. replace all damaged shims with new shims of same thickness."

as for if ya got the small spacer.

the smallest of the rounds rings is the small spacer. when ya got the small spacer, ya use a torque value to tighten the drive gear nut.

fwiw. i replaces my brg. set on my drive due to bluing (over heating, one of the criteria for replacment) of the brg. cups. this thread may help too.

Thanks Ziggy. I took the bearings apart. Didn't feel any pitting with my fingernail in the races. The gears appear to be in pretty good condition actually. I do have the small spacer in there, so that means to torque the 1" locknut on the end to 70-80 ft.lbs?

I'm just waiting on my new yoke, which should be here on Monday, to put it all back together.....uhh, the waiting

 

[ziggy]

Re: MC-1 Bearing Assembly Reassembly

so that means to torque the 1" locknut on the end to 70-80 ft.lbs?

from the attachment from sm#4. i'd say that universal joint pinion nut is the item to be referenced. 80 ft lbs looks right to me. though i don't know why ya say 1''. looks like it's 5/8'' x 18 to me. also keep in mind that the nut and washer are one time use items. once torqued down and loosened, they need to be replaced.

 

[yjanray]

Re: MC-1 Bearing Assembly Reassembly

from the attachment from sm#4. i'd say that universal joint pinion nut is the item to be referenced. 80 ft lbs looks right to me. though i don't know why ya say 1''. looks like it's 5/8'' x 18 to me. also keep in mind that the nut and washer are one time use items. once torqued down and loosened, they need to be replaced.

Thanks again Ziggy. I had to use a 1" socket to get that nut off. Didn't know that I had to replace nut and washer.....Think those are specialty parts, or I can just pick some up at local hardware store.....

 

[ziggy]

Re: MC-1 Bearing Assembly Reassembly

Think those are specialty parts, or I can just pick some up at local hardware store

i'd say they're special. i got the oem ones when i did mine. pretty critical nut and washer imho too which is why i went oem. i sure wanted it done proper as best i could to prevent failure.