MichaelH Posted April 6, 2020 Report Share Posted April 6, 2020 Hi All I rebuilt my TR4A engine introducing a lip seal at the rear main and all went well apart from a persistent tink tink tink So I went in search of the cause : looking first at rocker clearance, could a rocker be touching the rocker cover The noise started with the engine and was more noticeable at low revs when the engine made less noise Anyway with covid-19 restrictions I went the whole hog and took the engine and box out and strip the thing down again The lip seal was still there, the camshaft was smooth and not clicking , the cam followers and cam shaft were unmarked The only thing I could find was loose little end bearings According to an engine building friend the gudgeon pin should just slide out of the conrod little end under its own weight: well mine just fell out and were clearly loose in the bearings I could waggle the pin in the rod The conrods were ones that I had ground smooth as in Kastner competition black book years ago when the 4A was a race car so they didn't owe me anything My question to the forum is: who has replaced little end bearings as there is a Churchill tool according to the Workshop manual but more importantly once in the little bearings need to be honed exactly square. Has the forum addressed this in the past as I can't find anything on it (I do have a "Can't find it Gene" according to my wife) Thank you in anticipation of your general advice Michael Hunter Quote Link to post Share on other sites
Lebro Posted April 7, 2020 Report Share Posted April 7, 2020 Interested in replies to this, as I think one or more of my small ends are rattling. Bob. Quote Link to post Share on other sites
Rob Salisbury Posted April 7, 2020 Report Share Posted April 7, 2020 It's a job for a well equipped and Triumph friendly workshop, in the past Sutton Rebore have done both 4 pot and 6 pot rods for me, it's not expensive but you need someone who knows what they are doing. Cheers Rob Quote Link to post Share on other sites
Motorsport Mickey Posted April 7, 2020 Report Share Posted April 7, 2020 Hi Michael, give Nick Bonham a call, I don't know if he is still working but his firm do a grand job of it and will hone them square to the big end diameters also. Failing that even Lenton Engineering in Nottingham (Radford I think from memory) can press in your supplied little ends and hone them for you. Mick Richards Quote Link to post Share on other sites
trchris Posted April 7, 2020 Report Share Posted April 7, 2020 Hi Michael I too had a rattle when warm and on tick over went with a little more revs thought it was cam followers so removed and replaced , cam lobes looked ok no change so removed cam for better look found cam bearings badly scored so out with engine to replace which turned into rebuild. I too had a loose little end which I believe to be the cause of the original noise so had the con rods sent away for new little ends to be fitted which needs to be done on a jig to keep the rod square. Engine rebuilt and running fine although not yet run in Chris Quote Link to post Share on other sites
MichaelH Posted April 7, 2020 Author Report Share Posted April 7, 2020 Thanks Guys In the present situation I have found at set of old conrods which have tighter little ends which I can use with this engine (road use only these days) But your comments push me to drag out the cams shaft bearings and check them, I have a home made tool to push the thru although it does mean that I have to take that round plate out of the gearbox end Cheers Michael Quote Link to post Share on other sites
Lebro Posted April 7, 2020 Report Share Posted April 7, 2020 1 hour ago, Rob Salisbury said: It's a job for a well equipped and Triumph friendly workshop, in the past Sutton Rebore have done both 4 pot and 6 pot rods for me, it's not expensive but you need someone who knows what they are doing. Cheers Rob Sutton Rebore is no more, but SRS Engineering (also in Sutton) are recommended to me for such jobs. I was going there anyway to get my head skimmed, & hard valve seats put in. I can see this job growing ! Bob. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.