Morris Minor Owners Club

Bought a compression tester on e-bay, cost £9.29

Arrived eventually & looked good but didn't work, which I put down to a possible missing rubber washer in the sliding connection.
PM'd the seller & they said they'd send the missing part. But no, a whole new kit arrived.
That doesn't work either
only goes up to around 30 - 40 psi on both cars engines!

beware cheap compression testers seem to be the answer.

Wonder if anyone else has had similar experience?

Chris

Mine works fine, it screws into the plug hole thread.

Lucky you , Mike

I tried that & it still didn't work!

Hard to believe........ Are you using it correctly ? You must have the engine hot - after a good run is ideal - take ALL the plugs out - screw the tester firmly into the first spark plug hole, enough to get a good seal - hold the throttle open (a brick is ideal) - and crank the engine over for ~ 5 seconds. It should read ~ 160 psi or 10 to 11 bar if it's metric. There should be a little 'release' button that you press - before moving on to the next plug hole.

I have used compression testers years ago, so I know what needs to be done.
Alas, that tester was lent out ages back, never returned & can't remember who it went to.
Funny how often that's happened!

Anyway, I can only get readings of about 30-35 psi / cylinder on the engines of BOTH cars, so it's clearly nonsense.

My son has said he will lend me one when he comes visiting on Wednesday but being a very impatient person I may spend a bit more & buy one from a local factors before then.

But if my son lends me his, I may never give it back & in time he'll forget who he lent it to...fat chance!

cheers
Chris

Perhaps your son will be 'lending ' you back your own tester from years ago......

Well, decided not to wait for my son bringing his.
10/1 he would have forgotten anyway.

Bought a "proper" one, Gunson.

Results show 170 psi dry on each cylinder, so ends the bee in my bonnet that there may have been burnt valves, seats or whatever

That's a good pressure - your engine is fine !

Yes it is, very pleased
I am aware though, that the engine seems to have lost some Zip since we got the car in July.
I need to look elsewhere....carburettor overhaul (it is an HS4) maybe
& replace the dizzy with new one from accuspark, connecting a vacuum pipe to the carb

Don't worry about 'carb overhaul' - but do make sure it makes full throttle when the pedal is on the floor (but NOT before!) and the npiston is rising falling freely - and going all the way up. Use 3 in 1 oil in it. Working vacuum unit will help.