14 replies to this topic

[don neate]

hi i ve got a 1974 mini with a 1275 engine with 1 3/4 carb which i put in, think engine is a 1980 ish when you start up from cold no smoke run ok but when gets to running temp it starts to smoke only on over run switch engine off when warm then start no smoke , it pulls well no knocks engine run nice on ticket over you can rev up when stop no smoke  had all 4 bores check,  compression was 150 on each bore i am thinking it some thing to do we head has anybody got any ideal i am thinking of buying another head dont want to waste money  

[A-Cell]

Could be valve oil seals. How much oil does it use? (Assuming no major leaks)

[minimuk]

Deffo valve stem seals gone...

[Marco1972]

Valve seals are the cheapest option so change them first you will soon see if there past it when you remove the rockers n springs if there hard then there knackered

Usually a nice cheap n easy fix before spending big bucks on a new head

[nicky55]

Can you repeat that in English? Or in any known language

[Willthewelder]

We don't all speak 'Laandan. People give advice and help freely and for nothing which saves some people a lot of money by giving them the confidence to do the job themselves rather than a garage. It's a bit knob ish making a rather snide remark on your first post and without any valuable input into the topic.

[Dan]

  Give the valve seals a go as they are cheap enough and the latest MPi ones are excellent, but I suspect you will find the valve guides are on their way out too.

[jpw1275]

dont buy a head just yet.... as stated above and get yourself a haynes manual aswell as you will need it...;0)

[don neate]

hi thanks folks for the comments  think I will try and change valves steam and seals  and see what happens it does not drop oil it burns it 1/2 litr every 350 miles

[cal844]

valve stem seals mate!

[ACDodd]

Its a 33year old engine, start saving.

 

AC

[minidaves]

well said ac

[Marco1972]

For our friend from London

Very happy to explain to you in SIMPLE ENGLISH if needed or get yourself a Haynes manual all will become clear.

[johnnyblaze]

As said by everyone valve stem seals, but in my opinion id pull the head and have it rebuilt , new guides , valve grind and new seals that wont cost to much, that way you have a nice new head and if you do decide to rebuild the motor as AC was getting at , its only the the bottom end that you need to do , so its not such a big cost at one time.

[Fast Ivan]

to be honest it doesn't sound like the valve seals to me, sounds more like worn bores/rings. the good compression test results being due to the oil sealing the rings, the lack of smoke when cold being due to the oil being thicker than when warm. bad seals/valve guides normally manifest themselves with smoke on start up.

that said the cheapest and easiest thing would be head issues, hopefully its as simple as valve seals. but certainly check the valves and guides for wear, the valve seats for pitting, maybe they could do with a lapping, and give the head a good clean, payen gasket and retorque after the first heat cycle and finger crossed