engine and drivetrain M10 engine overhaul questions

[bzuva]

My engine, despite having 108k miles on the clock, isn't in the best condition possible... So I'm planning to fix it, but since m10 spanned all the way to E30, I was wondering which parts of the E21 and E30 M10 engines match the 02 series M10? I don't want to replace the engine since mine is matching numbers, and given the small number of 02's in Serbia it would have been a blasphemy

[flyingjolly]

What do you mean with "not in the best condition"? Do you need new pistons *and* a new head? The most important thing is to match the head and the pistons. I assume you have a 2002 with a 121 head? This means you need the pistons matching the 121 head. So if you need both, there's possibilities to take another head from a later model. Which one exactly has to say somebody else.

But you can take the starter out of an E32 and E34 M30 engine. It's smaller, lighter and more powerful.

[bzuva]

I haven't still opened it up, but it has lost a couple of HP and it eats oil.

[c.d.iesel]

LOOSE piston to cylinder clearance

stuck/broken piston rings

loose valve stem to valve guide clearance

loose valve guide to head fit

bad valve guide seals

poor valve/seat sealing

carbon

improper carb mixtures, improper ignition timing

leaking seals and gaskets

all contribute to current condition

nothing from M20 fits M10 motor

maybe start by changing motor oil, coolent, gas, proper

'tune up' adjustments, compression test, see if

you just missing basic care points causing

yout percevied power loss,

check for full throttle opening at the car

when the gas pedal is held to the floor - really

basic stupid easy stuff first.

welcome to your addiction

[bzuva]

Thanks man! Anyway, probably there is something about the valves and the carburetor, the car has been driven on gas rather than petrol for some time, I guess that killed the carb and the sealings...

[c.d.iesel]

GAS ? vs PETROL ??

do tell.............

[bzuva]

http://en.wikipedia.org/wiki/Liquefied_petroleum_gas

This kind of gas, I guess you are not quite familiar with this in the States

[TobyB]

Nah, we'd just call that 'Propane', probably incorrectly.

Before you tear it down, do a leakdown and compression test.

That might help figure out if you need headwork, a full rebuild, or just some

tuning.

If your mileage is all city, I could see a 100k motor needing a full rebuild.

But it might just need valve guides and valve work.

How much oil does it consume?

t

[bzuva]

I've been driving it for around 250-300 miles and it shows a yellow lamp while braking, not sure about the exact measures... Anyway, that mileage is achieved mostly by previous owners, 3 of them, the first drove it for 24k miles, and then the second killed it by putting propane and driving for the rest, transporting lumber etc. so that's the period the engine lost it's vitality. Anyway, when I get onto some cash, I'll go into fixing this issue... Then hopefully I just need to fix the clutch and exaust, and then it's over as far as mechanic goes