Did compression tests today on my son's T25 with 2.0 CU engine. No.1 105psi No.2 155psi No.3 140psi No.4 145psi Not the original engine which was a 1.6, and this 2.0 came with the van. Van has done 110, 000 miles, its a 1980. Plugs all look good and dry, no black soot or oiliness. No blue or black smoke from exhaust.
Do No 1 again, if that was the cylinder that you started with.. just in case the cranking improved the other cylinders compression while you were checking No.1. If its still bad, then you have some kind of leakage on No 1 : it has significantly worse compression. If its not oily then more likely its a valve. Most likely the No 1 exhaust valve/seat being a bit burnt, or the seat is falling out.
So ... What's the problem - # 1 is low but is it causing issues or are you just worried... Sent from my SM-G960F using Tapatalk
It has the 2.0 CU engine with twin solex pdsit carbs plus an 010 auto gearbox. The engine now starts and revs well and idles about 1200 rpm which prevents auto box stalling. Out on the road it has no power and we are trying to find out why. The timing is spot on, the fuel system was replaced, its getting fuel, the carb butterflies open fully, auto chokes work correctly. Its a bit tappety and we plan to adjust the hydraulic tappets shortly. Timing gun shows the rpm and each plug is sparking and all 4 plugs are very good with no soot or oil or fuel. In my mind its either an engine problem or auto box problem. The auto box kickdown is not working correctly and maybe I need to tighten the throttle cable a bit more to pull the kickdown arm further. We seem to be trying everything.
Good idea to focus on No. 1 as the others are all good. With the engine warmed up the No. 2 sounds tappety and we removed the valve cover and there was some up and down tap tap with one valve. No tap tap with the No 1. and all tight but suspect they may be too tight. We will adjust the No. 1 and No. 2 and see if that makes a difference
