cu engine low compression

[stew0145]

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

[BOXY]

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.

[stew0145]

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

[Paul Weeding]

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

[stew0145]

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

[Paul Weeding]

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