Mike 5 fan Posted January 10, 2020 Report Share Posted January 10, 2020 Can anyone help please. I bought a TR in May and have been working on it ever since! I have a broken main bearing cap and would like to try a second hand replacement, does anyone out there have a knackered block that the wouldn't mind taking a cap off? Thanks, Mike. Quote Link to post Share on other sites
Motorsport Mickey Posted January 10, 2020 Report Share Posted January 10, 2020 4 minutes ago, Mike 5 fan said: Can anyone help please. I bought a TR in May and have been working on it ever since! I have a broken main bearing cap and would like to try a second hand replacement, does anyone out there have a knackered block that the wouldn't mind taking a cap off? Thanks, Mike. Err...Might help Mike if you told the forum WHICH cap you need, I know it will need work whichever but I should always go for the most alike cap in positioning because they sometimes have different profiles on various engines. Mick Richards PS: How broken is it ? depending but they can sometimes be "reworked" to retrieve it. Quote Link to post Share on other sites
Bfg Posted January 10, 2020 Report Share Posted January 10, 2020 Sorry I don't have a spare but might I direct you to < this > which talks of their being matched to the block when it was originally line bored. Quote Link to post Share on other sites
Motorsport Mickey Posted January 10, 2020 Report Share Posted January 10, 2020 14 minutes ago, Bfg said: Sorry I don't have a spare but might I direct you to < this > which talks of their being matched to the block when it was originally line bored. Quite correct Pete but depending upon which dimensions are adrift on the replacement mains cap and it being wide enough to still register and locate in the block it may be able for it to be fitted and the block again align bored to make it again correct and usable. Mick Richards Quote Link to post Share on other sites
Waldi Posted January 10, 2020 Report Share Posted January 10, 2020 Mike, sorry I can’t help you with a bearing cap, but be aware you will have to machine the cap and bore otherwise your bearing shells will not be properly aligned with the crank shaft journal. Waldi Quote Link to post Share on other sites
RogerH Posted January 10, 2020 Report Share Posted January 10, 2020 Hi Mike, you have set yourself a rather daunting challenge. Why not contact somebody like TRBitz, Revington or TRGB. They have piles of stuff. Or - repair the broken one as good as possible to give you the correct shape and consider getting a new one manufactured - that could also be a challenge. Roger Quote Link to post Share on other sites
roy53 Posted January 10, 2020 Report Share Posted January 10, 2020 i wish you good luck.Above advice re line boring correct. if no luck try those who build competition engines as they replace the standard with steel caps. Roy Quote Link to post Share on other sites
JochemsTR Posted January 10, 2020 Report Share Posted January 10, 2020 Mike, I replaced my main caps with steel caps. New boring. No big deal for a Triumph engine builder and not that costly. Jochem Quote Link to post Share on other sites
Tim T Posted January 10, 2020 Report Share Posted January 10, 2020 I needed one for my rebuild due to knackered crankshaft. Gerry at Enginuity in London came up trumps with a replacement longback crank and bearing cap. Tim Quote Link to post Share on other sites
Mike 5 fan Posted January 11, 2020 Author Report Share Posted January 11, 2020 Hello All and thanks for the replies. It's bearing number 3 and the last ½ inch has broken off. This would be held in place when bolted up but I would like a better solution. Enginuity say they may have one so I'm going to talk to Gerry when he's in on Monday. Quote Link to post Share on other sites
jerrytr5 Posted January 12, 2020 Report Share Posted January 12, 2020 Pretty sure I have some. PM me if you want me to go and hunt in the quartermasters stores Jerry Quote Link to post Share on other sites
Mike 5 fan Posted January 13, 2020 Author Report Share Posted January 13, 2020 Thanks Jerry but Enginuity are sending me one, thank goodness. Thanks to all for comments and advice given. Regards Mike. Quote Link to post Share on other sites
Motorsport Mickey Posted January 13, 2020 Report Share Posted January 13, 2020 23 minutes ago, Mike 5 fan said: Thanks Jerry but Enginuity are sending me one, thank goodness. Thanks to all for comments and advice given. Regards Mike. That's good news Mike but as posted by myself and others you can't just bolt it in and use it. The outer bearing cap dimension may need altering to allow it to "nip" in to the dimension of the block locations (it should not be just a drop in) and then the cap needs checking to confirm it will present the bearing in line with the others so the crank is supported neither being "nipped" nor pushed the crank out of line. As pointed out it is likely to need align boring to ensure the crank runs true and without stresses. Mick Richards Quote Link to post Share on other sites
Mike 5 fan Posted January 17, 2020 Author Report Share Posted January 17, 2020 Thanks Mick, rest is sorted, just needed the end cap which I have, thanks to Enginuity. I'd tried everyone you could think of to no avail, so very relieved. Thanks again to all for your input. Regards Mike. Quote Link to post Share on other sites
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