Groove in crank shaft end. Normal? Fix? (pics)

[Artago]

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On the front case side. Underneath the crank shaft seal.

The back side of the seal runs in the groove.

I assume this is not normal?

Related thread: Help find the oil leak! (LOTS of pics)

I wont be replacing the crank or taking it out so should I:

1. Ignore it, install a new seal and put it back together.

2. Install a seal with a larger inner diameter

3. Install a seal with a larger depth (so it's not running in the groove)

4. Fill the groove with RTV and reinstall

5. Fill the groove with JB weld

Or can anyone suggest something better?

Thanks

 

[BogusSVO]

I wont be replacing the crank or taking it out so should I:

1. Ignore it, install a new seal and put it back together.

2. Install a seal with a larger inner diameter

3. Install a seal with a larger depth (so it's not running in the groove)

4. Fill the groove with RTV and reinstall

5. Fill the groove with JB weld

Or can anyone suggest something better?

Thanks

1. NO

2.NO will have worse leak

3. This may work

4. NO, really, how long do you think that would last??

5. NO See #4 above


Buy and use something like this.

Mitsubishi 4G63 4G64 G63B G64B Front Crank Seal Repair Sleeve Requires grinding crank to re-size !

 

[jbeaton9292]

I wouldnt trust that u could get a leak through that and smoke a motor i know its worse case senario but still i would look for another

 

[killercolt]

Slap a new seal back on there and call it a day. 4g63t will seal up with that groove there.

 

[swifteagle]

Can't really tell how deep it is but you could clean it with 1500 grit sand paper and put a new seal on it.

 

[Artago]

1. NO

2.NO will have worse leak

3. This may work

4. NO, really, how long do you think that would last??

5. NO See #4 above


Buy and use something like this.

Mitsubishi 4G63 4G64 G63B G64B Front Crank Seal Repair Sleeve Requires grinding crank to re-size !

K. Can I regrind the crank without removing it? Is that something I can do in my garage or is it not doable? Tnx

 

[BogusSVO]

The crank has to be round, the best thing to do is have it machined to the specs for the repair sleeve.

 

[-red97rum-]

How deep is the groove? How bad does it catch on your fingernail? The last motor I put together had a pretty deep groove from the front oil seal too. I installed a new seal and didn't have a problem.

You can also mod the tension spring on the new seal so it will "hold a little tighter."

 

[Artago]

The crank has to be round, the best thing to do is have it machined to the specs for the repair sleeve.

So I'd have to remove it then which I would like to avoid.

My only other option is to install a deeper seal so that it doesn't run in the groove.

The question is, where do I find one and what dimensions should it have?

How deep is the groove? How bad does it catch on your fingernail? The last motor I put together had a pretty deep groove from the front oil seal too. I installed a new seal and didn't have a problem.

You can also mod the tension spring on the new seal so it will "hold a little tighter."

Yeah the groove it pretty deep. Definitely catches the finger nail.

 

[Trilogy Turbos]

Machine it or sleeve it. That is the "lip" of the seal marking the crank. Odd uh? Rubber can cause that. You're probably leaking a good amount of oil there too.
Regards,

TRILOGY TURBOS

 

[SmoochDarling]

I would see if you can smooth it out and then tighten the spring in the seal. This is a shitty situation no doubt.

 

[Artago]

It's been brought to my attention that a "Speed Sleeve" might do the trick with the minimal effort.

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Here is the (part of) the sizing chart.

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The guy at the local auto part store looked it up on the computer and told me I need Sleeve (stock Number) 99177 for the shaft based on the 45mm seal on my front oil case he also looked up on his PC.

However, I measured the crank and mine reads 43.96-44.01. Based on that and this chart I would think I need a smaller sleeve, like the 99170.

Has anyone installed one of these on the crank and if so, which sleeve do I want?

Follow up question: What diameter is the stock 4G63 crank on this end? 45mm or 44mm? Is there a chance that mine was ground down from a 45 to a 44 by my engine builder?

 

[BogusSVO]

99177 will be to large by almost 1mm, so it will just spin and will not press into place.

The 99170 will be closer than the 99177, but will still be to large on the ID by appox .006 /.16mm

so it will not press fit on either.

So by your chart, and a few i looked at in some parts books, the 99171, is too small by .017 /.44mm

I checked silver seal and Pioneer catalogs.

Doubtful it will stretch that far, hence why that part of the crank needs to be ground

 

[Artago]

99177 will be to large by almost 1mm, so it will just spin and will not press into place.

The 99170 will be closer than the 99177, but will still be to large on the ID by appox .006 /.16mm

so it will not press fit on either.

So by your chart, and a few i looked at in some parts books, the 99171, is too small by .017 /.44mm

I checked silver seal and Pioneer catalogs.

Doubtful it will stretch that far, hence why that part of the crank needs to be ground

Do you happen to know if anyone else makes a sleeve that would work without me having to grind down the crank?

I'd be able to pull the crank out but I'm not a mechanic so putting is back in properly has me worried so I'd like to avoid it.

Thanks,

Tomas

 

[BogusSVO]

Bedding the crank is not that big an issue.

Torque the mains
Torque the rods

Done

I could not find another speedy sleeve in the size you need.

That is why I checked a couple catalogs.

 

[DSM1G90]

Rubber can cause that.

Not rubber, but teflon - which hardens up after time and with exposure to heat.

Why it's a good thing to replace seals while doing belts even if it's not needed since you got that front end all exposed-along with the rear main seal when doing clutch, and with automatics plan on doing them also after time ... even camshaft seals should be replaced after time.

-DSM

 

[Artago]

Bedding the crank is not that big an issue.

Torque the mains
Torque the rods

Done

I could not find another speedy sleeve in the size you need.

That is why I checked a couple catalogs.

I've never taken apart a motor before. I'll need to find a write up with details before I decide to try it.

Do you happen to know the stock crank is 44mm or 45mm on the front end?

Thanks

 

[killercolt]

It is obvious that your oil leak did not come from the front main seal. Put another front main seal on there and be done with it. You are trying to be too fancy. Unless you put 5+ quarts of oil into your engine, it will not likely to leak there. I seen that groove all the time when changing the front main seal on a 4g63t. I seen completely dried up front main seal and the same groove on the cranks of many 4g63t's and the oil does not leak out of that area.

Most oil leaks on a 4g63t are from the cam seals and the oil pump drive gear seal. The rear main seal and front main seal are not very likely to leak.

 

[DSM1G90]

"Bzzt! Wrong answer Hans"! Any seal where the teflon dries up will begin leaking no matter if main, cam or oil along with any spring loaded seal made out of teflon.

And when teflon hardens, it's almost like glass and will cut into mild steel.

Been there with crank and cam areas.

-DSM

 

[Artago]

So it looks like I have no other choice but to remove the crank, have it ground, and install a sleeve Dale suggested.

Are there ANY alternatives that I may have missed?

If not, are there any good write ups for removing this thing and more importantly, reinstalling it. Please link any write ups you think will be useful.

Dale: When I have the crank ground down. What spec should I tell the machinist to grind it to for this sleeve?

Mitsubishi 4G63 4G64 G63B G64B Front Crank Seal Repair Sleeve Requires grinding crank to re-size !

1.708 inches (43.38 mm)? Seems very small. Thanks.

 

[lowell]

A new seal shouldn't leak even with a groove like that.
If you're really concerned about it, just put the seal in a different position.

 

[Artago]

A new seal shouldn't leak even with a groove like that.
If you're really concerned about it, just put the seal in a different position.

That's what my dad suggested. Do I need to install a spacer to "gap" the seal out?

 

[arrowhead]

Try National oil seals they as well as Dorman, make repair sleeves for many applications.

 

[Artago]

Try National oil seals they as well as Dorman, make repair sleeves for many applications.

Any idea where I can find a sizing chart so I can find the right fit?

 

[arrowhead]

If they make it it will be listed with the listing of front crank seals, they are called, Ready sleeves.
If I can find it ,I will let you know