Morris minor lack of power

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Morris minor lack of power

Postby Sammy-lou » Mon Jun 04, 2018 7:43 pm

Hello,
I'm looking for help on my Morris minor. Hope someone can help.
My minor is my daily car, and currently it's not playing ball though

The car currently won't drive past 40mph, while having to feather the accelerator,
So far I have renewed and changed:
Condenser
Points
HT leads
Coil
Changed carburettor
Spark plugs
Checked fuel for water
Stobe timed
And compression test with all 4 cylinders showing 50-75 psi
I am stumped what to do next. ..apart from change head gasket. Any ideas would be grateful as cycling on a pushbike 12 miles a day to work and to get shopping supplies isn't my ideal day of fun
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Re: Morris minor lack of power

Postby Plin » Mon Jun 04, 2018 8:42 pm

:D Welcome to the forum Sammy-lou.

:? Sorry to hear of your power woes - I haven't got a clue about your troubles, though is your accelerator cable ok? I can't imagine it is that but when I had a cable snap years ago the lovely (not!) AA man after insulting my daily Minor put a new cable in, all was fine as we tried it out round the car park but dreadful when out on the open road as he had not adjusted it properly so could not get above 25 mph!!

Hope you sort it soon.
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Re: Morris minor lack of power

Postby Sammy-lou » Mon Jun 04, 2018 8:58 pm

Thank you Plin :)

Yes I have checked cable that Is all fine sorry about your AA numpty lol (not all are but seems a lot of breakdown people think they know stuff when they dont) . Seems more u accelerate the more power drains can't figure from where :( blooming pain in bum! We saved the morris from being crushed at scrappy and built it up out of bits some new some panels etc from another they were scrapping. Love him to bits but he's being a right pain in the beep at moment :lol:
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Re: Morris minor lack of power

Postby The vast minority » Tue Jun 05, 2018 5:53 am

Welcome
Does it freewheel ok? Are wheels getting hot? does it roll about in neutral with handbrake off ok?
Have you set the valve clearances?
Al
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Re: Morris minor lack of power

Postby Sammy-lou » Tue Jun 05, 2018 7:44 am

Hello the vast minority,
Thank you for your reply :)

Yes it free wheels OK :) there's no getting hot wheels (mind you a hot wheels car would do more than the morris right now :lol: :lol: )
Yes rolls about in neutral with handbrake off fine and valve clearences have been set.
I'm just baffled unless engine I's now giving up :( did have a bit of strain other day driving boss about who is not a small person :lol: think the morris is telling me it needs a break lol
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Re: Morris minor lack of power

Postby Sammy-lou » Tue Jun 05, 2018 12:15 pm

I have taken head off I think two of valves are gone... what do you think? ... put a picture below: picture1
It did now and again dribble oil from it. I do have a second head which I think is unleaded can I use the head straight up as gasket fits perfect?picture2/3
20180605_125512.jpg

20180605_125709.jpg

20180605_125727.jpg
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Re: Morris minor lack of power

Postby woodywoodchipper » Tue Jun 05, 2018 5:35 pm

you need to make a couple more post's to get pic's to show,

unless 1 of the mod's can help,

welcome,

Alan,
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Re: Morris minor lack of power

Postby Custard » Tue Jun 05, 2018 8:00 pm

50-75 psi is too low.

A rebuilt engine will generally be above 150.

Below 120 I would generally be looking at doing something and below 100 it probably starts and ticks over not too bad just like a low compression stationary engine, but as we used to say wont pull the skin of a rice pudding.

The trick now is to see where the compression went rings/bores, valves or just a head gasket.

Low but identical on all four tends to indicate general wear unless your pictures show the gasket blown between 1 and 2 and also between 3 and 4.

Sean.
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Re: Morris minor lack of power

Postby Sammy-lou » Tue Jun 05, 2018 11:49 pm

20180605_125512.jpg


Head taken off :S
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Re: Morris minor lack of power

Postby Panky » Wed Jun 06, 2018 9:08 am

The exhaust valve on No3 looks badly recessed but that doesn't explain the low compression readings on all four pots. I'd try your spare head but do another compression test after it's torqued down but before you connect all the ancillaries to check the readings.
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Re: Morris minor lack of power

Postby Custard » Wed Jun 06, 2018 10:03 pm

Looking at that I would have expected No 1 to have been a bit higher than the others.

It looks stained between 3 and 4 and again but a little less so between 2 and 3.

Did the block have matching marks.

Price of a gasket is far cheaper than paying a machine shop so as stated above I would try your spare one.

While it is off you can also rotate the engine with the starting handle, as the pistons go down you can see what the bores are like and when they are at the top you can see if you can move them side to side to see if there is a lot of play.

Sean.
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