Rod Seizing....Bad Bearing?
Turbo Mini Forums

So I put in my last rod last night with new Duraglide 780 bearings and once I torqued it down, the crank would no longer rotate, take off the rod, rotates fine.
I thought it might be a bad cap matching job or something so I swapped bearings with a rod that was spinning fine and it spun fine but now the other one seized.
Has anyone ever gotten a bad bearing? Are there any other causes for this? It seems really odd but I can't think of anything besides the bearing.

take your rod and remove the bearings, then stick the cap on and feel with your fingernail for a little over hang. The cap might be warped.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
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have you tried repeating with each half of the bearing? to narrow it to a problem half?

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

...or try the bearings from other rod...

Pedro Silva

http://miniciados.blogspot.pt/

Maybe my description wasn't clear. I took a bearing from another rod and put it in the stuck rod. The stuck rod was no longer a stuck rod (it spun freely).
Putting the stuck bearings in the rod that previously spin made that rod seize as well. I'm pretty sure it's the bearings but I hadn't heard of anyone getting bad bearings.

just have a look and see if you can see any imperfections, if you can scrape them off. colour the shell with a marker, refit and rotate (dry) and the high spot should be obvious.

does it only stop rotating when torqued or does it do it when nipped too?

another thing to check is that the groove for the shell tang is clear and not nipping the shell in on the edges.

Edited by matty on 25th Jun, 2014.

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1/4mile in 13.2sec @ 111 terminal on 15psi

if theres any part no stamping on the back of the bearing check for high spots,

Have you put the cap on the wrong way round?
I made this error...

Could the crank have been reground on not all lobes?

Bore gauge the bearings and mic the journals.

Or simple mans way, use plastiguage

also check the bearing crush heights

Edited by Sprocket on 26th Jun, 2014.

as above from what i under stand its a bearing prob as you swaped then and it was ok so lake above check high spots


hijack this a little bit
sprocket how dose one check bearing crush heights?
install shells on rod and cap then sit them together and feel gauge the mateing face?
what should we be looking for?

Feeling like a bit of an idiot for not catching this but it turns out that two of the bearings caps were actually 010 size. I don't know how this happens because they all came fromt he same box but what a pain! Hopefully Minispares can help me out, this is where shipping from the UK is a bummer

0.010" under size on a STD journal with 0.002" clearance is a tight fit lol

Yep, that definitely explains why things were looking or feeling right. I didn't think to even check as they were all in the same shrink wrap.
ACL is being a major pain about helping so hopefully Mini Spares can offer something

I've seen this before!

If something is worth doing, it's worth doing half of.