dellyend1 Posted June 27, 2021 Report Share Posted June 27, 2021 Hi All, have adjusted all valve clearances to the recommended 0.25mm and now the tappers are noisy at idle, could not really hear before. Had several valves that had a slightly too large gap ( 0.35mm on a couple) and one that was less than the 0.25mm and could not insert the feeler gauge. So it did need it and it ticks away like a sewing machine but just wondering if this is ok ? I’ve always been told slacker valve clearance is better than too tight . It’s a rebuilt engine so no idea what happened on the irregular clearance thicknesses ? if an aftermarket set of rockers , are there any other gap / clearance figures I should be using which is why I have the tapping many thanks jeremy Link to comment Share on other sites More sharing options...
68vitesse Posted June 27, 2021 Report Share Posted June 27, 2021 Gap for standard rockers is 10thou cold, if non standard I suggest speak to the supplier. Regards Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 27, 2021 Report Share Posted June 27, 2021 we assume this is a std triumph cam not something special 0.010" is 0.25mm thats the normal clearance for a cold engine did you use the rule of 13 ie 1 down set 12 and so on ??? worn rockers will have a stepped wear on the pad so a feeler will bridge this and you get a false feel to the feeler fit click adjust can help with this but they can e a bit fiddly as it takes up any wear on the pad with it idling does using an old feeler inserted quieten it ??? Pete Link to comment Share on other sites More sharing options...
68vitesse Posted June 27, 2021 Report Share Posted June 27, 2021 Oops sorry didn't realize you are using a foreign measuring system. Regards Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 27, 2021 Report Share Posted June 27, 2021 it is oxford ha ! you cant beat old money Pete Link to comment Share on other sites More sharing options...
dellyend1 Posted June 27, 2021 Author Report Share Posted June 27, 2021 Ok, thanks All. I have no idea if standard cam or not as I can’t contact the previous owner who had the engine re-built. No idea how I would tell either other than looking at the car itself. I used the Haynes manual sequencing for the valves which states when 2 are fully open (down) adjust the following two. would you recommend a further crack at it using the rule of 13 and doing each valve individually ? many thanks jeremy Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 28, 2021 Report Share Posted June 28, 2021 your 2 down do the other two is fine providing the other two are 180 deg from the firing order so with 1 and 2 dropped you check from 153624 the opposing cylinder on its compression TDC stroke or you end up witha hopeless nighmare sounds like thats where you are right now so if you are uncertain about all this ( it does save more engine turning) but is often misguided so a 13 rule on the 6 cyl cant go wrong pete Link to comment Share on other sites More sharing options...
dellyend1 Posted June 28, 2021 Author Report Share Posted June 28, 2021 21 minutes ago, Pete Lewis said: your 2 down do the other two is fine providing the other two are 180 deg from the firing order so with 1 and 2 dropped you check from 153624 the opposing cylinder on its compression TDC stroke or you end up witha hopeless nighmare sounds like thats where you are right now so if you are uncertain about all this ( it does save more engine turning) but is often misguided so a 13 rule on the 6 cyl cant go wrong pete Cheers Pete, I’ll give it a go. All good practice 😊 Link to comment Share on other sites More sharing options...
Badwolf Posted June 28, 2021 Report Share Posted June 28, 2021 When I reset mine, (for the first one ever) I found out that they were 'set' to about 20 thou imperial. No wonder she sounded like an overgrown sewing machine. Reset to 10ish (well, my first attempt!!), now much quieter. Makes me wonder if the previous person that set them set them to 25 thou instead of .25mm. Makes you think. If the Yanks can crash a multi million dollar probe on Mars/Venus (can't remember which) by sending the right numbers in the wrong unit of measurement, there is little hope for us. Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 28, 2021 Report Share Posted June 28, 2021 well mars are getting smaller and ive nver met a Venus live in hope its inches for me your inside leg in mm sounds horrific . Pete Link to comment Share on other sites More sharing options...
dellyend1 Posted June 29, 2021 Author Report Share Posted June 29, 2021 Thanks All, before I commence the rule of 13 method, excuse the daft question but how tight should the gap be with the feeler gauge inserted ? I’ve always done it so that you tighten and move the feeler gauge until you feel slight resistance or tension. I’m just wondering if people’s experiences on the GT6 is that it should be tightened and the feeler gauge is a lot harder to remove with a lot of resistance but stopping short of clamping it dead ! Many thanks . Jeremy Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 30, 2021 Report Share Posted June 30, 2021 a good "feel" to give some noticable resistance on moving the feeler nothing is pecualiar to any triumph engine to tight NO its easy to start to compress the valve and the gaps is tight biggest problem is worn rocker pads so the feeler bridges the wear and the gap will be greater at the contact point than the feeler you are using then a small amount of less gap can resolve a rattler as i said if some are persistent stick an old feeler in the gap when its idling if that solves the tapping its a worn pad something the click adjust type of tool will solve but they are not the easiest tool to master Pete Link to comment Share on other sites More sharing options...
PeteH Posted June 30, 2021 Report Share Posted June 30, 2021 With worn (potentially) Rockers. (assuming you have access to such). I find the use of a Magnetic base and Dial Gauge can produce an acceptable result?. More of a fiddle, that I admit, largely due to finding a place to "stick" tha base, but can improve accuracy. Pete Link to comment Share on other sites More sharing options...
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