Engine overhaul for e30 M40...

[EuJax]

HI guys, Recently my m40 engine has been pretty loud and may due for an overhaul. But as i have no experience at all with engine overhauling, i'd like to hear your advice and experience in the process. What to look out for and what need to be change and how would the outcome suppose to be. I always had this thought/perception that after an overhaul, the engine would not be as fit as new but i could be totally wrong. Thus like to hear your views before deciding. Thanks all and cheers. Regards

 

[mizhan]

one reason for overhaul is required when your engine internals have worn out substantially. therefore, you're actually taking it back to almost new condition. there is the general approach, but different mechanics have their peculiarities as well as what items that truly require replacement.
this question is better answered by buying sifus a drink and listen to their advice.

 

[mizhan]

p/s - my E30 engine is still on the floor after being overhauled. even so, it already looks sexy. can wait for the shell to be ready

 

[Lionel_Koh]

How about M42 conversion?????

 

[mizhan]

How about M42 conversion?????

good idea!

 

[chili e30]

you said your engine run very loud does it come out white smoke? the sound if come from engine & the sound is like teck teck teck & without any smoke you just need to change valve lifter.if white smoke just do top overhaul if black smoke do top & bottom.

 

[EuJax]

Hi mizhan, thanks for sharing your experience. No probs on buying a drink Where do you guys meet up recently?
Btw, what do you change this time of your overhaul? Just top or both bottom as well?

Hi Lionel, M42...hmm not for me

Hi Chili e30, there is not white smoke but sometimes when i floor it there will be some black smoke, supposingly the carbon from the engine. And yes, alot of 'teck teck teck' sound So i suppose i need to do top and bottom overhaul....sigh...

So guys, what would be a reasonable price for a good overhaul job? A rough figure including change of everything needed....i was quoted RM 6k by M1. Is it fair and reasonable? Thanks.




Regards

 

[ICEMAN 68]

with the 6k price tag i would rather get another type of engine ...etc m42 , m20 or m50 ..

m40 legendary problem of lifter noise is a norm and this may set you somewhere around 1.5K to 2K to a top overhaul.
items that you may be looking at are worn out cam lobes , lifter and the rocker arm .... cam's will set you close to rm600. lifter will set you close to rm 500 and the arms around another 3 to 400 ...well this is what they usually quote without the labour....

and after all these , you may soon get back the lifter sound say about 6 months usage and depends on how frequent you do an oil change ....

so in short i would rather leave the m40 and get another engine , " if i need to spend rm6k "
i won't say m40 is not a good engine , but it needs extra care and frequent oil change to pro long it's life span.

used an m40 for 8 years and well it served me well i would say ...

 

[miepower]

with the 6k price tag i would rather get another type of engine ...etc m42 , m20 or m50 ..

m40 legendary problem of lifter noise is a norm and this may set you somewhere around 1.5K to 2K to a top overhaul.
items that you may be looking at are worn out cam lobes , lifter and the rocker arm .... cam's will set you close to rm600. lifter will set you close to rm 500 and the arms around another 3 to 400 ...well this is what they usually quote without the labour....

and after all these , you may soon get back the lifter sound say about 6 months usage and depends on how frequent you do an oil change ....

so in short i would rather leave the m40 and get another engine , " if i need to spend rm6k "
i won't say m40 is not a good engine , but it needs extra care and frequent oil change to pro long it's life span.

used an m40 for 8 years and well it served me well i would say ...

Well said Ice

Hence, you and your engine is growing up yeah...:wink: all the best

 

[chili e30]

what 6k?:stupid:what i know top & bottom is about 2.5k-3k the most.maybe you can ask miepower or iceman 13 where can do it cause they got good sifu who can do it.if need more than 3k i rather change m20 b25.

 

[dewahujan]

i suggest try D'carbon.cost around rm40..

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Membersihkan karbon didalam combustion chamber, injap, palam
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Mengembalikan prestasi enjin hampir ketahap asal
Mengurangkan pelepasan asap terutama kenderaan yang menggunakan
diesel sebagai bahan bakar
Mengurangkan gegaran, kebisingan dan melancarkan operasi enjin
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Menjimatkan penggunaan minyak
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Menanggalkan lapisan karbon didalam ruang pembakaran (combustion
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Bertindak sebagai agen pembersih karburetor dan penyuntik bahanapi
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[mizhan]

better than STP products? about same price.

 

[dewahujan]

i don't know.but it's work in the same way i think.try to my e30.feel better.more pickup..!

 

[elwine30]

Overhaul is not the only option lah young man. . So, do your ground work. There are different school of thoughts from different people advising you.

Therefore, i would suggest you check on your budget and what you want at the end of the day. That should point you the right direction.

 

[EuJax]

HI everyone,

Thanks all for your advice. Appreciate them. But what i want is simple, i do not want upgrage or conversion, i just want to make the engine back to as good condition as possible. RM 6k is about the max i am ready to pay at this moment, of course who wouldnt want a cheaper alternative but i do not know what other alternatives i have other than engine conversion or overhaul......

My plan is to get another car, roadster or convertible, if you check my other threads you will understand. But i love the E30 so much i do not want to part with it and would like to keep it as pristine as my pocket allows.





Regards

 

[elwine30]

Then just do a top overhaul will do. If yr car is not eating black oil or puffing any smoke. Having loud engine just need a top overhaul.

 

[mizhan]

Then just do a top overhaul will do. If yr car is not eating black oil or puffing any smoke. Having loud engine just need a top overhaul.

agreed 100%

 

[EuJax]

Hi guys,

But wouldnt a top and bottom overhaul be more like it since considering the age of the engine, 1990 but mileage is reasonable at 130k km? Any thoughts?

Also, usually how long would the overhaul take? A week or two?


Regards

 

[elwine30]

i killed my engine at 300,000 kms for my M40.

The top overhaul should be around 5 days or less. But if it's full overhaul, it may take more than 2 weeks.

plus, overhauling your entire engine is gonna cost you more and to me it's not cost effective. Might as well, plunk in a M42 engine and you get more for your money.

If budget and you want to keep it simple plus your sympton is just noise, do a top overhaul, change your camshaft and get a brand new AFM. You should be a happy man.

 

[cempaka]

Hi guys,

But wouldnt a top and bottom overhaul be more like it since considering the age of the engine, 1990 but mileage is reasonable at 130k km? Any thoughts?

Also, usually how long would the overhaul take? A week or two?


Regards

First do a wet/dry compression test to get some hard data about the condition of your engine. Who knows you might not even need an overhaul to begin with. If you do decide to proceed with an overhaul, it will also give you information on where problems might be.

Top overhaul depends on the shop, both how fast they work and how they define overhaul, and also on the condition of your cylinder head. But yeah around 4-5 days is a good guess.

I agree that you shouldnt bother with the bottom overhaul. 130k km is nothing for a BMW bottom end. As long as your piston rings are still sealing well, which it sounds like they are, it's pointless and could actually end up worse after the overhaul than before (eating oil etc.)

If you are still itchy youre better off spending that money on having some basic flow work done on your cylinder head while it's out. Porting, valve job, etc will give you added power if done correctly.