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Crank collar fitment

NEO25T

By NEO25T,
in Engines & Forced Induction

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NEO25T

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Posted (edited)

Hi guys just wanted to ask for your advise about the fitment of this crank collar.

The grub screws are drilled about 3mm into the crank, i have taken them out and not screwed them back in all the way.

My concern is it looks like the crank has been machined so the collar will slip on and loctite used to help hold it.

I hope im wrong but what are your thoughts, would you be happy to use as is, if not what are my options.

Thanks ?

Screenshot_20180424-085059_Gallery_resized_1.thumb.jpg.79d104de72293c6479712f2862b110ba.jpgScreenshot_20180424-085029_Gallery_resized_1.thumb.jpg.08c1d599654b1f4a1c98e59ccfe979ba.jpgScreenshot_20180424-085112_Gallery_resized_1.thumb.jpg.f1e720028c6649433f847420cd054f5f.jpg

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NEO25T Collaborator

NEO25T

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They were like figjam do you know how many engines we do here, really poor attitude when i asked them about.

Said they would not have sent it out if that was the case but the owner didnt see it before i picked up.

Tone changed a little when i said it had red loctite and they wanted me to bring it back for them to inspect, but things got a little heated and i said i wouldnt let them touch it.

Ben C34 Grand Master

Ben C34

Posted
Posted

It's tricky to say for sure. They may have gone above and beyond and used the loctite even though it wasnt required. Or they realised it slipped on and loctited it.

 

Loctite is pretty good stuff, but for such an important part of the engine I wouldn't want any doubts .

Definitely sucks to not know for sure

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NEO25T Collaborator

NEO25T

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Im thinking lightly warm with heat gun and give it a twist to see if it moves.

On the other hand the loctite and grubscrews should hold it?

Possibility to have it welded maybe, im just not sure.

Hi octane posted a pic on facebook where a crank nose had snapped off, so ive got it on my head this is going to do the same lol.

Its dangerous when you have a little bit of information......

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Its meant to be a shrink fit.  No loctite. If the grubscrews have been screwed into the crank you can be sure the collar has been fitted improperly. The  fix is to build up the crank with weld and machine it down to the correct size to achieve a shrink fit.

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Dobz Experienced

Dobz

Posted
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Should be taken back to hear what they have to say about it. How many people work there, is there a chance someone dodgy in the workshop did the job? 

The proper course of action is to have the collar taken off and sizes checked, you also want to see if they put a decent radius in the corner. Too small of a radius could lead to snappage.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
3 hours ago, Ben C34 said:

, wouldn't it make more sense to just get a new crank collar made and achieve The Shrink fit with the new collar rather than welding and grinding a crank which would certainly cost heaps more?

Not if you can make the idiot who made the mistake  rectify it at his expense. Plus the holes drilled in the nose of the crank should be filled with weld. But failing that I guess you could get a new custom crank collar made but unless you had the means to make it yourself it would not be cheap.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
2 hours ago, NEO25T said:

I wonder if different manufacturers collars are slightly different sizes.

Not a precise measurement but the crank measures 35mm where the collar slides on

The crank collars I used to sell are made in large quantities on  CNC equipment and do not vary at all or from Tomei or other collars. It is obvious that the person who turned down the crank made a mistake or just did not know what a shrink fit is... in this case the crank needs to be left 0.05 to 0.1mm larger in diameter than the ID of the collar.

NEO25T Collaborator

NEO25T

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21 hours ago, Dobz said:

So you're just going to give up that easy?

No just need a time out lol, im use to things not working out the first attempt or 2.

This car really should have been deregistered and sent to scrap but i kind of liked it so gave it a home, its been an interesting/ expensive 12 months of ownership......

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
On 4/26/2018 at 6:57 PM, NEO25T said:

No just need a time out lol, im use to things not working out the first attempt or 2.

This car really should have been deregistered and sent to scrap but i kind of liked it so gave it a home, its been an interesting/ expensive 12 months of ownership......

Typical Skyline ownership, when my motor exploded I was going to strap and strip the car.

Somehow, a few cans later a few drunken discussions with people I ended up spending triple the car's worth and now have a built motor and a barely working car LOL.

 

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