Club 80-90 Forums

hi, ive just bought at t25 with the 2.0 cu Aircooled engine.it had been stood for a year before i got it. it only seems to be running on cylinders 3 and 4. ive checked that ive got a spark (replaced coil + plugs anyway). i checked compression, found 1 + 2 low (75). im unsure how to go about checking the tappets as i think they are hydraulic? could it be these that arent working properly, holding the valves open? any help would be gratefully recieved

Here's everything you could need to know about hydraulic tappets.

http://www.ratwell.com/technical/HydraulicLifters.html" onclick="window.open(this.href);return false;

You could always wind the adjusters completely out so the valves stay closed and check the compression again.

thanks Boxy, much appreciated. Will check the compression again tomorrow with the adjusters wound out. fingers crossed its nothing too serious

Did you check the compression with the throttle fully open??

yeah Paul checked it with the throttle open, not had chance to have another look today. might have to wait till the weekend now. thanks

Ok, well don't wind the tappets fully off then... One full turn puts them roughly at the untentioned buy the lifters stage...

Check the comp again, and if it's still low a squirt of oil in the bore to see if it's rings or the valves that are leaking the pressure