drmini in aust wrote:
Crank will come up fine, give it a degrease and water blast first then hit it seriously with a stiff rotary wire brush.
Followed by another degrease.
Yep you were right. I just need to get some more degreaser as I've used up my last batch!
drmini in aust wrote:
Kennomini wrote:
Can you safely sandblast a crank or will it damage the journals?
I used to get them shot blasted back in the 60s for fatigue resistance.. we'd tape the journals up first but leave the radii clear.
I think sand might be a bit aggressive, I'd maybe wrap all the journals good in tape first though and don't overdo it.
A rotary wire brush then angle grinder flap wheel would be safer.
I think I might just stick with the wire brush rather than sand blasting. I'd tape the old bearings over the journals to protect the crank
Scoop wrote:
I think you need a 1 5/16 socket. I had the same issue!
Yes I do! Luckily I was able to borrow a socket to get the crank out today. I needed a pretty long breaker bar to get it undone...
Thankfully the crank ended up ok. It will probably need to be taken a size under, but I need to confirm what size it is now. The 1098 one is on the right and 998 on the left.
It had +40 pistons in it already
The last 998 engine was in good condition internally, and had been stored with oil in it. Unfortunately the bores have a bit of rust in them. It had definitely been apart at some stage, the lock tabs on the big ends were a bit dinged, and there were new style gaskets throughout. It was in a similar condition to the other 998, if they had been stored indoors it would have been as easy job to get them going again.
At this stage I'm still not sure of the next plans for them. There is an option to pick up another 1098 for spares, which might be good even if that just yields another crank...