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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 12-17-2012, 04:10 PM   #1 (permalink)
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Replacing crankcase bolts

Im currently working on the engine of my t140d as it needs new valve guides and the cylinders need repainting. At first i was also going to split the cases however ive now decided there is little point as there is nothing wrong with the bottom end. But i would like to either replace all of the bolts or get them zinc plated. So can i replace the crankcase bolts one at a time without causing any issues? Sorry if it sounds like a silly question!
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Old 12-17-2012, 04:35 PM   #2 (permalink)
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Shouldn't be any problem. You can get nice new zinc plated bolts & studs from places like Monty's Classics in Tavistock, or stainless ones from Molnar Precision (these are expensive though!)
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Old 12-18-2012, 02:26 AM   #3 (permalink)
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That's good to hear, thanks!
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Old 12-18-2012, 07:28 AM   #4 (permalink)
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Just come across this on ebay, looks a fair bit cheaper than Molnar...

http://www.ebay.co.uk/itm/Triumph-T1...item416e9df0e9
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Old 12-18-2012, 08:49 AM   #5 (permalink)
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I've bought stuff of that guy before, several times. No complaints
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Old 12-18-2012, 10:43 AM   #6 (permalink)
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Are stainless bolts ok to use?

And can all of the bolts from under the crankcase be removed? I think i've read about the gear selector cover bolt or something?
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Old 12-18-2012, 11:49 AM   #7 (permalink)
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there are several issues with any bolts

There's a possible issue of stainless and aluminium seizing/corroding. You can apply a release agent/inhibitor (coppaslip) to stop this.

There's an amazing amount of incorrect stainless stuff so buy from a recommended supplier esp if replacing vital stress loading parts. ( most of my stressed bits are from Andy Molnar - who builds Nortons and should know what he's doing) I have a stainless rear axle and wouldn't buy that off ebay.

Don't remove any bolt unless you know what will happen. An expensive sounding "clunk" is a sickening sound.
Clean any engine bolt surgically before replacing it. If it's under the engine. Why bother? You can remove the gear index bolt but don't move the gear lever if it's out.
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Old 12-18-2012, 04:08 PM   #8 (permalink)
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I honestly don't think there should be any problem at all in replacing each crankcase bolt/stud one at a time, and using stainless items to do this with. I think some people are wary of using stainless bolts because they've heard they have lower tensile strength than the original zinc plated bolts. While there may be some truth in this, in practice it is generally irrelevant because the torque settings used for crankcases are way below the limits of either stainless or HT steel of that diameter and length. In other words, if you were to tighten a crankcase bolt to say 3 times the recommencded torque a stainless one might snap whereas an original one might not. But tightening within the limits specified in the manual, no such problem will be even remotely approached. You won't overstress a 5/16" bolt at 20-odd ft/lbs whether made of stainless or not.

As for Molnar, it was his reputation that caused me to put a lot of faith in his products. However, it is obvious that a lot of what he sells is merely off the shelf stuff obtainable at lower cost from any stockist of stainless fasteners. I don't think many of his items are really made on the premises, but are simply bought in and, in a few cases, tweaked a little to make them look unique. I've just bought a set of extended front disc bolts and a rear wheel spindle nut & washer, and I'm not very impressed. The heads of the bolts are not well polished (lots of coarse marks) and the stainless Nyloc nut is just a standard product available at half the price locally, and its washer is so dull I'm going to have to polish it myself. Not what I'd call good service at his prices!

Last edited by JohnA; 12-18-2012 at 04:13 PM. Reason: Loads of typos!
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Old 12-19-2012, 04:54 AM   #9 (permalink)
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yes,

I've since discovered that Tricor make a lot of stainless stuff ( same part number but with a small S on the end)

I've been happy with Andy's stuff though.
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Old 12-20-2012, 04:12 PM   #10 (permalink)
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I managed to win a set of used crankcase bolts on ebay so i'll get them media blasted and zinc plated as well as the other engine fixings.

I also need new valve guides for my t140d so i thought id ask here before making a new post. Basically which are the best that can be bought in the UK, and should i replace the valves at the same time?
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