A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
I -think- my front pulley (for the belts) is OK - I did some measuring of it today and it seemed to be true, so I think I just need the bit the cambelt runs round, although it may be best to err on the side of caution!
I don't think it has a crank sensor - I think it's only got the cam sensor on mine; certainly there was nothing apparent when I was looking at it earlier, nothing that I saw anyway. Mine's a V reg hardtop, if that helps?
I've found info online that the crank weighs about 9Kg, and I'd guess the pulleys would add a couple to that?
However, reading through the Suzuki manual for the jimny it appears that they are very precise about bearing sizes (measuring both the journals and the bearing cap), so I'm a bit concerned that the crank won't be a straight swap and I'll end up needing to either get it machined and get a new set of bearings and so on, which would defeat the object?
Anyway, if you can give me a price with ballpark postage (for, say 15Kg), I'll have a think about it, rather than you having to strip it all down and weigh/price it exactly? I'm not in a huge hurry, not planning on doing anything on it for a couple of weeks at the earliest as I have other projects on the go...
Google "miata lwsc" (lwsc = lightweight sports crankshaft!) and you can find out how people fix this same problem on early Mazda MX-5s with Loctite. It seems to hold up OK. Probably the same root cause; the crank nose is a bit too small for the job. On later cars Mazda fitted a different crank with a bigger nose and keyway, which completely solved it.
The mx5 loctite fix doesn't really work it always fails again usually within a few months , on the mx5 the only real fix is a replacement crankshaft or a new engine. If it were my jimny I'd be looking at changing the crank/ engine that way you know the problem won't come back.
Roger - I essentially did the loctite fix yesterday so I could get the car running properly (when the pulley was moving, the timing was therefore changing, and it was totally gutless). The problem is that the rear of the pulley (and the shoulder on the crankshaft) have worn in an uneven manner, so despite my best efforts the pulley isn't running true, hence needing to replace the pulley and get the crank shoulder ground back and a precise spacer fitted to make the space up. The car isn't being driven at the moment, and given what Biasmechanic says (and indeed my own intuitions about the 'repair' I did, even if it had run true) I'd like to do it properly.
I've had some good news - the crank pulley is only £30 from Suzuki, much cheaper than I thought, and the sump is sealered in place, not with a gasket, further reducing costs. Grinding will be £20, and ground stock plate isn't too expensive so it could be a fairly cheap fix, and the engine itself runs like clockwork.
However, I do need the right dimension, so if anyone can help out with that, I'd really appreciate it.
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