Nick Jones Posted March 22, 2021 Report Share Posted March 22, 2021 3 hours ago, AidanT said: Yet another Novice question! I notice that my cylinders have been lined / Sleeved. Does this infer that the engine had a hard life prior to my ownership? Aidan Are you sure they are sleeved? It’s not common. The marks left by the head gasket fire-rings can be very misleading. Nick Link to comment Share on other sites More sharing options...
Roger K Posted March 22, 2021 Report Share Posted March 22, 2021 1 hour ago, AidanT said: All the bearings have been replaced, possibly needn't have been done but least I know it's all good now. I don't know the engines history so it's a new start for it What's the crank thrust endfloat? Link to comment Share on other sites More sharing options...
AidanT Posted March 23, 2021 Author Report Share Posted March 23, 2021 Nick, Yes, the Machine shop confirmed it Roger Good question - what is the crank thrust end float? 🤔 Note the title above "Novice" Aidan Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 23, 2021 Report Share Posted March 23, 2021 its the rear bearing has semi circular thrush washers fitted to control minimal front to rear float of the crank and takes the thrust when you operate the clutch old engines can wear badly i would expect the M/c shop to get this right figures in the book Pete Link to comment Share on other sites More sharing options...
Roger K Posted March 23, 2021 Report Share Posted March 23, 2021 With the crank assembled in the block, stick a dial gauge on the nose of the crank and lever it back and forth along its long axis, taking readings off the dial gauge. As Pete says, the figures are in the book. If it moves further than spec, you should be able to get some oversize thrust bearings (the half-circle ones mentioned above) to bring it back into spec. Triumph 6 cyls are known for the block wearing where these bearings sit, a very difficult repair. Correct me if I'm wrong - not worked on one of these for several years, so repair situation may have changed. When buying a car with this engine fitted, the first thing I used to do was get the owner to idle the motor and press the clutch in and out. If I could see the crank pulley moving, alarm bells rang... If no dial gauge it can be done with feeler gauges, but not so accurate. 1 Link to comment Share on other sites More sharing options...
AidanT Posted March 23, 2021 Author Report Share Posted March 23, 2021 18 hours ago, Roger K said: What's the crank thrust endfloat? 5 thou with standard thrust washers - A little tight maybe? Aidan Link to comment Share on other sites More sharing options...
Roger K Posted March 23, 2021 Report Share Posted March 23, 2021 0.006-0.014” is the book figure, I think. Did you use a dial gauge, and lean hard on a big screwdriver in both directions? It sounds fine, but won’t have shrunk. If it’s really 0.006” rather than 0.005” I’d leave well alone. Link to comment Share on other sites More sharing options...
AidanT Posted March 23, 2021 Author Report Share Posted March 23, 2021 Measurement from the machine shop - not sure how he measured it - Will get my DTI out @ the weekend 😊 Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 23, 2021 Report Share Posted March 23, 2021 trust the experts you cant go round checking everything you had them rework Pete Link to comment Share on other sites More sharing options...
AidanT Posted March 23, 2021 Author Report Share Posted March 23, 2021 18 minutes ago, Pete Lewis said: trust the experts you cant go round checking everything you had them rework Pete Won't be an issue Pete will it? 1 thou less than book Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 23, 2021 Report Share Posted March 23, 2021 you can check whatever you fancy but a good m/c shop will have all that covered or you will be checking piston and big end clearances next sleep easy Pete Link to comment Share on other sites More sharing options...
AidanT Posted March 23, 2021 Author Report Share Posted March 23, 2021 I'm not going to worry! Lots to do but going to run out of time before the builders move in! Current garage being converted New double being built All going in to storage for 12 weeks What Fun! Link to comment Share on other sites More sharing options...
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