mattyb Posted October 27, 2015 Report Share Posted October 27, 2015 (edited) 6 Arrived Friday ... Compression test shows very low values on No 1 and No 2 (had to battle with a spare battery losing its charge !) (25 psi ) adding a drop of oil makes little or no difference on 1 and 2 Head gasket gone ? I've used a cheap endoscope and pistons are not holed - valves are opening and closing and valve seats look good (even the exhaust !) values for the rest of the cylinders are "OK" ish 50 to 90 psi (low compression cf engine ) not brilliant The exhaust manifold to down pipe studs look like fun (not) any advice ?? pics and full report to follow ! Edited October 28, 2015 by mattyb Quote Link to post Share on other sites
TriumphV8 Posted October 28, 2015 Report Share Posted October 28, 2015 Looks like a worn engine. Mostly the piston rings I bet. As it will be stripped anyway you can remove manifolds and the valve cover and remove spark plugs and insert a connection to compressed air instead. Apply some pressure when that cylinder has valves closed and is on BDC. Listen where the air blows out and open radiator cap to look for bubbles. Quote Link to post Share on other sites
mattyb Posted October 28, 2015 Author Report Share Posted October 28, 2015 Also If one of the spark plugs is replaced and compression tester is inserted in the other cylinder i.e. spark plug in cyl 1 , compression tester in cyl 2 , I don't think if makes any difference to the readings ? Engine has done 104k and no history so probably tired ! thanks for the reply Andreas - As mentioned, I did add 3 or 4 squirts of oil to the cylinders which did not alter the readings - would this not indicate that rings are OK ? Quote Link to post Share on other sites
TriumphV8 Posted October 28, 2015 Report Share Posted October 28, 2015 Yes normally that should make a difference but as you tried something and things do not become clearer this is the next step to find the culprit easy and besides the plug for the air supply it is all an easy job and will help a lot. Quote Link to post Share on other sites
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