Tuesday, December 16, 2014

Crank Polish and New Bearing Shells

<This post is part of the 'Winter Project 2014/15 - New Engine Rebuild' project>

After one failed attempt at buying and rebuilding a spare engine, I kept on searching ebay and eventually struck lucky with a newly machined partly assembled 998 lump which was something of a bargain. As they say however, 'caveat emptor' as bargains can sometimes come with problems. In the previous post, I detailed how upon close examination, I found small particles which had got in and ruined the bearing shells and scratched the the crank journals.

So that leaves me with the task of fixing the problem...

Given my distinct lack of engine building knowledge and experience, I had no way of judging just how bad the scratches were. They may have been insignificant, but I didn't want to risk going to all the effort of rebuilding the entire engine for it to conk out with bearing failure in a few thousand miles so, I was going to have to defer the decision to a professional.

With specialist engineering shops a bit thin on the ground these days, I was a bit worried that it was going to be a difficult search and also expensive. After a few enquiries with friends and contacts though, I was lucky enough to find a shop not too far away with a good reputation.

After a quick call to check they could fit me in, I paid a visit and was immediately greeted with that unmistakable whiff that only engineering workshops have. It's an indescribable aroma that sums up for me all that is good and proper about the world. That along with the sight of so many old engines in various states of repair left me feeling a little nostalgic about the 'good old days' when Britain was an industrial force to be reckoned with. It's reassuring to know that a small part of that lost world is being kept alive in places like this up and down the country.

It's equally reassuring to have an expert to cast an eye over the problem and give their advice and thankfully the damage wasn't too bad. The crank didn't need regrinding and could get away with just a repolish which was great as it would make the job cheaper.

With that sorted, I also got advice on the best bearing shells to get hold of and ordered them while I was there. Leaving the crank overnight, I picked it up the next day along with the bearings. Spraying the crank with WD40, I loaded it into a black plastic bag and taped it up to make sure no rust would form on the newly polished journals.

And with that, another obstacle has been overcome and I am one step closer to getting my shiny new replacement engine. Can't wait.

Now I just need to get a clutch and flywheel sorted and get the whole lot in the engine.

For updates, stick a 'Like' on Wayne's Mini Progress facebook page.

1 comment:

  1. Bmw 1 2 3 4 5 X1 X3 X5 16d 18d 120 D N47 E90 E91 Crankshaft Bmwcrsn47 Brand New!
    High Standard Crankshaft
    Motor Type: BMW - 1, 2,3,4, 5, X1, X3, X5
    Engine Codes: N47 D20 A, N47 D20 C, N47 D20 B, N47 D20 D, M47 D20 (204D4), B47 D20 A
    Part Number: BMWCRSN47
    Compatible Part Number: BMCRNK-N47
    Note: Our N47 Cranks Does Not Comes With Gear.