m20 botton end rebuild costs

[steve_k]

right then folks i've got the chance of getting my hands on a m20b25 & i'm looking at rebuilding the bottom end (allready got a rebuilt top end) & i'm trying to find out where the best place to buy the big end bearings & piston rings would be & how much.

also any idea as to the cost of getting the barrels honed?

thanks in advance for any help/advise.

[steve_k]

back to the top.

anybody got any advise?

[badassyas]

i have everything in Mahle. i wish you asked me before you posted this as all the mahle numbers on the boxes are in a black dustbin bag somewhere. but i'll try double checking!

[steve_k]

i have everything in Mahle. i wish you asked me before you posted this as all the mahle numbers on the boxes are in a black dustbin bag somewhere. but i'll try double checking!

cheers for that dude
any idea on price?

[badassyas]

the rings i bought off the forum but the shells i bought from an engineer shop. will get back to you soon as!

[steve_k]

the rings i bought off the forum but the shells i bought from an engineer shop. will get back to you soon as!

cheers dude

[StuBeeDoo]

My M20 bottom-end is currently with the reconditioners.
I'll let you know the final price when I get it back. Hopefully later this week.

[steve_k]

My M20 bottom-end is currently with the reconditioners.
I'll let you know the final price when I get it back. Hopefully later this week.

cheers dude

[ross2009]

i done my bottom end luckily i got the rings with the bottom end i bought but i know from gfs or ecp the rings are 25 quid a piston my crank regrind and with them supplying the mains and little ends came to about 350 but i got it for i think was 250 coz i know them
its the over sizes bearing thats the killer i think the mains where like 80 quid and the little ends where about 50 or 60 and the regrind was about 100
everything else is little like oil seals and sump gasket etc hope this helps

[steve_k]

ross2009 cheers dude thats a big help

just waiting for stubeedoo to come back with the cost of his now.

[StuBeeDoo]

OK, I took my bottom-end to the local reconditioners still assembled and told them to get on with it.
They washed it, stripped it and checked all the tollerences.
The bores were honed, new standard size rings fitted. The mains checked and put back as they were fine. The big ends were polished and new shells fitted.
Then it was reassembled with new crank and idler shaft seals.
Total cost £440:36. I got a new oil pump and sump gasket from BMW and IIRC they came to about £150.
So, mine was near-as-dammit £600.

[ross2009]

600 quid
thats abit steep

[steve_k]

OK, I took my bottom-end to the local reconditioners still assembled and told them to get on with it.
They washed it, stripped it and checked all the tollerences.
The bores were honed, new standard size rings fitted. The mains checked and put back as they were fine. The big ends were polished and new shells fitted.
Then it was reassembled with new crank and idler shaft seals.
Total cost £440:36. I got a new oil pump and sump gasket from BMW and IIRC they came to about £150.
So, mine was near-as-dammit £600.

stubeedoo cheers for that fella
now just got to find someone round here to do it for me

[daimlerman]

600 quid
thats abit steep

Look at it this way;
£440ish was the total,presumably including VaT.
Rings,inc VaT would be £125,so a labour cost of about £315,the strip,clean,check and re-assembly would take 8-10 hours,or a labour rate of £30-£40ph,not too bad,really.
Just shows,though,what could be saved by a bit of DiY!

[ross2009]

exactly ive done mine myself obviously not he regrind but i halfed that figure
but then again some people dont know the ins and outs of an engine

[daimlerman]

M20 is a lovely,logical engine to strip and re-build.Very difficult to get things wrong with it.

[ross2009]

yep i agree but then again ive done sooo many engine builds i think every engine is but then again most engine are the same basic priciples just different variations

[steve_k]

ross2009 how much would you charge to do a bottom end rebuild for an M20B25??

[ross2009]

Erm dunno really lol never built any for any one else o actually I have I done my mates Audi s4 when he melted a piston email me mate bradley651@hotmail.co.uk
Well have a chat

[StuBeeDoo]

So, mine was near-as-dammit £600.

..... And the full engine rebuild worked-out at £1700.
Head cleaned-up and refaced/rebuilt. New BMW head set.
New BMW cam, rockers and shafts
Plus the bottom-end and getting the flywheel faced.

[StuBeeDoo]

600 quid
thats abit steep

Just shows,though,what could be saved by a bit of DiY!

Would that I had the space (even a small bench) to do stuff like lapping-in valves, etc, etc.
I have to pay to have stuff like that done because I can't be arsed to do it sitting on any empty space I can find on the garage floor. Come to that, a garage with mains electricty would be nice.
To say that it's galling to have to pay someone to do stuff that I'm capable of doing myself is an understatement.

[e301988325i]

Would that I had the space (even a small bench) to do stuff like lapping-in valves, etc, etc.
I have to pay to have stuff like that done because I can't be arsed to do it sitting on any empty space I can find on the garage floor. Come to that, a garage with mains electricty would be nice.
To say that it's galling to have to pay someone to do stuff that I'm capable of doing myself is an understatement.

But in reality, a house with a double garage would be 270K here, at least £15k for the extra garage, so that's a few engine rebuilds straight away!