crank chewed out

[nissannewby]

If its only for the balancer and not timing related you could just get another keyway cut and then refit.

[DilboBaggins]

20140817_124811.jpg

Here is a picture of it, do use think its repairable? Cheers

[Punderhead]

<img src="http://www.nissanpatrol.com.au/forums/attachment.php?attachmentid=48537"/> Here is a picture of it, do use think its repairable? Cheers

It might be possible to have it sleeved and them recut the keyway, however that isn't the strongest.
A better option would be to weld the shaft, remaining round, and recut the key, however that can cause warpage

Iif the shaft is hardened. Which it should be. both these will be quite expensive. It may be cheaper to just buy another for cost, and that way you have the rig off the road for less time

Cheers

[DilboBaggins]

Thanks for the info mate, I am still in the process of saving up to get it done. I am trying to weigh up my options but nobody can give a set price except nissan for a new crank (2k) plus id have to get a new balancer, new belts ect. And pay for labour for someone to take the crank out for me wish I had the space and equipment

[happygu]

Looks repairable to me, as the keyway slot is only damaged badly on the trailing edge, but it is not totally destroyed.

This looks like a possible candidate for a weld and grind.....

The things I would consider are, do you need it repaired quickly, are you going off the beaten track regularly .... if the answers to both of these are yes, then the best answer might be to grab a good second hand crank and harmonic balancer from Patrolapart, and buy a new key to make sure it will be good for the long term.

It will take a machine shop a few days to get that fixed depending on their workload, and you are going to only save a couple of hundred dollars, and sounds like you will possibly always worry if the repair will hold.

[cos]

Is a small weld , so little or no warpage . Extra care on choosing right weld is important ( tig and alloy rod ... ) .


Main screw was no tight enough or harmonic balancer is way too loose fit on shaft . Maybe a Loctite 648 will solve the problem of loose fit ( for loose key/keyway also ) .

[happygu]

Is a small weld , so little or no warpage . Extra care on choosing right weld is important ( tig and alloy rod ... ) .


Main screw was no tight enough or harmonic balancer is way too loose fit on shaft . Maybe a Loctite 648 will solve the problem of loose fit ( for loose key/keyway also ) .

Good advice Cos,

Another alternative is JB Weld, but I haven't actually used this before to know how well it would come apart later on, if required. It is a cold weld product.....

[cos]

Is not near strong enogh , just a bandaid or a method to limit too much play between parts ( or maybe good for a emergency repair to can reach home at your own wheels , driving very calm witouth using much gas pedal ) . Any respectable good shop press will pull parts apart later ( except the case of usind realy strong sintetic resin liberaly aplied - parts will com apart but the end result will be more than two , because of the angular grinder contribution )
For a good result is necesar to put in practice a strong and clean mecanical solution ( steped custom key , face pins or any similar ) , even if this mean is a custom solve for the rest of the life in this engine .

Sorry for my twisted romanianenglish , should pay much atention at school in my early age .....

[DilboBaggins]

Thanks guys, and cos, the bolt was hard to budge with a 2 metre breaker bar! I still have no clue as to how it happened. I wouldnt even try to weld it myself as ive never welded before hahaha. I trust the guys at this engineering joint to do the job when I have the coin, they do seem like they are well organized, they have there own crank man!

[cos]

I.m in no doubt of the fact at the screw was tight , but is a clear evidence of a free play ( if is no play , the key will be untouched ) . How this hapend is a interesant subject , and should hapend no more after reparation .

So you want to weld yourself ( super ok , analize fist all problem involved and weld after that ) but how restore the keyway after welding ?