Complete M20 Rebuild Parts List

M20/M30/M50/Whatever! All engine related stuff here.
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Complete M20 Rebuild Parts List

Postby M20_fever » Wed Mar 04, 2009 3:35 pm

I have been getting many questions about what is needed to rebuild an M20, so I thought I would post up a complete rebuild parts list for an M20. This list is intended for the B25 and B27 motors, some of this info may apply to B23 and B20 motors but no guarantee. If you need this list to know what you need, you will also need a Bentley manual, so get one.

Image
http://bentlypublishing.com/bmw/


This list starts from the top of the motor and works down.

* These items are only necessary if you find them to be excessively worn or damaged when you pull the motor apart.

** These items can be upgraded depending on the intent of the rebuild.

*** This item is specific to the ‘i’ or ‘e’ motor. Be sure you order the version specific to your motor.


Head/Upper Engine Cylinder Head Gasket Set* ** ***

Image

source: http://www.yiparts.com/data/001002/1-47cf5b6507215.jpg

bmw p/n: 11129059240

Head bolts**

Image

source: http://images.google.com/imgres?imgurl= ... s%3Disch:1

bmw p/n: 11121726478

Intake Manifold Stud to Cylinder Head*

Image

source: http://www.autohausaz.com/search/produc ... %20Washers

bmw p/n: 07129908133; 07129908134; 07129908142

Camshaft* ** ***

Image

source: http://www.bmwpartsweb.com/BMW-Parts/Ca ... 99176.aspx

bmw p/n: 11311716138

rockers* **

Image

source: http://www.bmwpartsweb.com/BMW-Parts-Ca ... Parts.aspx

bmw p/n: 11331271429

rocker eccentrics*

Image

source: http://www.bmwpartsweb.com/BMW-Parts-Ca ... Parts.aspx

bmw p/n: 11331744354

Intake Valve* ** ***

Image

source: http://www.bmwpartsweb.com/BMW-Parts/In ... 99176.aspx

bmw p/n: 11341708895

Exhaust Valve* ** ***

Image

source: http://www.bmwpartsweb.com/BMW-Parts/Ex ... 99176.aspx

bmw p/n: 11341708896

Valve Stem Seal Kit*

Image

source: http://www.pelicanparts.com/cgi-bin/sma ... 09%2F92%29

bmw p/n: 11349059172

Valve Springs inner/outer* ** ***

Image

source: http://www.msportster.co.uk/detail.asp?cat=9&offset=-1

bmw p/n: 11341706583 (b25 inner); 11341706584 (b25 outer); 11341267721 pre-12/86 b27; 11341708895 post-12/86 b27

throttle body gasket***

Image

source: http://www.autohausaz.com/search/produc ... d%20Gasket

bmw p/n: 13541289576

Exhaust Manifold Stud*

Image

source: http://www.autohausaz.com/search/produc ... %20Washers

bmw p/n: 07129908134

Exhaust Manifold Gasket w/ heat shield*

Image

source: http://www.turnermotorsport.com/html/de ... 1621728489

bmw p/n: 11621728489

Exhaust Manifold Gasket w/o heat shield*

Image

source: fap99.com

bmw p/n: 11621723877

Block/Lower Engine Lower engine gasket kit***

Image

source: http://www.pelicanparts.com/cgi-bin/sma ... 1984-91%29

bmw p/n: 11111730875

Timing belt kit w/tensioner*

Image

source: http://www.turnermotorsport.com/html/de ... 9-9320-000

bmw p/n: 11311713361(belt); 11311711153(tensioner); 11311267746(tensioner spring)

Water pump*

Image

source: http://www.schmiedmann.com/3_series/E30 ... /page2.htm

bmw p/n: 11519070759

Expansion Plug; 45mm Diameter Freeze Plug

Image

source: http://www.koalamotorsport.com/products ... 1+-+Engine

bmw p/n: 11111714712

Pistons* ** ***

Image

source: http://www.autohausaz.com/search/produc ... 622@Piston

bmw p/n: 11251735755 (note: this p/n is for stock b25 83,980MM piston, b27 piston p/n: 11251287039, oversize pistons are available for all m20 engines)

Connecting Rods* ** ***

Image

source: http://www.vacmotorsports.com/catalog/v ... t-of-6.htm

bmw p/n: 11241288386 (135mm b25); 11241278194 (130mm b27)

Main rod bolts**

Image

source: http://www.pelicanparts.com/bmw/catalog ... an_pg5.htm

bmw p/n: 11241713342

Crank Main Bolts **

Image

bmw p/n: 11111735525

Crank Rod Bearings** ***

Image

source: http://www.nexternal.com/vacmotors/imag ... -M10-L.JPG

bmw p/n: (note: since there are numerous bearing sizes depending on crank wear I will not list a p/n. If you don't know how to size your bearings bring it to a professional, or search)

Crank Main Bearings** ***

<see rod bearings>

bmw p/n: (note: since there are numerous bearing sizes depending on crank wear I will not list a p/n. If you don't know how to size your bearings bring it to a professional, or search)

Crank* ** ***

Image

source: http://www.bmwe21.net/forum/viewtopic.php?t=9490

bmw p/n: 11211713223 (b25); 11211276341 (b27)

Auxiliary/Intermediate Shaft Oil Seal

Image

source: http://www.autohausaz.com/search/produc ... Oil%20Seal

bmw p/n: 11121285609

Oil Pan Bolt

Image

source: http://www.ultimategarage.com/shop/index.php?cPath=49_300

bmw p/n: 07119915031

Oil Pump

Image

source: http://www.autohausaz.com/search/produc ... 1411720898

bmw p/n: 11411720898




Cylinder Head Gasket Set* ** *** – This is a must, and includes most of what you will need as far as top end gaskets and seals go. Recently some have complained that the kits do not include everything so keep all your old gaskets and seals to be sure you replace anything not included in the kit. Depending on the intent of your rebuild there are several options regarding upgrading the head gasket, search.

Fuel injector o-rings - These are being listed seperately becasue they are not always included in cylinder head gasket sets, but should be replaced.

Head bolts** - Always replace head bolts. Depending on the intent of the rebuild head studs are highly recommended to replace OE non-stretch bolts.

Intake Manifold Stud to Cylinder Head; 8x45mm* - These are optional depending on their condition, mine where rusted and the threads didn’t look very good so I replaced them.

Camshaft* ** ***- Cams rarely wear out, but it does happen. Be sure you get the correct cam for your motor. There are many upgrade options for M20 cams, search.

Rockers* **- Only required if any of yours are broken/cracked or the cam wear pad is severely worn upon inspection. Depending on the intent of the rebuild there are upgraded billet rockers available that eliminate the issue of them breaking at 7k+ rpm that some have experienced.

Rocker eccentrics- These should be replaced when ever the head is rebuilt; they are cheap and can prevent proper valve adjustment if worn.

Intake Valve* ** *** / Exhaust Valve* ** *** - These are only needed if you find they are worn or damaged, you will need these if your rebuilding due to a snapped timing belt. Note that there is a difference between ‘e’ and ‘i’ valves so order the correct ones. There are oversized valves available depending on the intent of your rebuild, search.

Valve Stem Seal Kit- Only needed if you’re removing/replacing the valves.

Valve Springs inner/outer* ** ***- only needed if they are too far out of spec to be shimmed. There are upgraded single springs available that are intended to replace the ‘i’ double springs, though I have never heard of anyone running them. ‘e’ motors run single springs, but are not the same as the single race springs that are offered by some vendors.

Throttle body gasket***- I listed this gasket separate because if I remember correctly my kit did not include it, do some investigation as to whether your kit includes it before ordering this part separately.

Exhaust Manifold Stud; 8x40mm*- Just like the intake studs they should be replaced if rusted or the threads are damaged.

Exhaust Manifold Gasket w/ heat shield* –Just like the throttle body gasket, may not be included in all top end gasket kits so check before you order. Depending on the intent of your rebuild individual exhaust manifold gaskets w/out the heat sheild are available with part# 11621723877.

Lower engine gasket kit***- Just like the top end gasket kit, this kit will include most of the gaskets/seals you will need. Keep all your old gaskets/seals to match up with what’s in the kit to be sure you have everything.

Timing belt kit w/tensioner – Always replce the timing belt and tensioner. Since the M20 is an interference motor the timing belt should be replaced any time tension is relieved from the belt.

Water pump – This should always be replaced on any rebuild. The timing belt and water pump have the same maintenance interval, so they should always be done at the same time. Do it while you have everything apart.

Expansion Plug; 45mm Diameter Freeze Plug – These are prone to rust from the inside, so even if they appear to be solid from external examination they should always be replaced.

Pistons* ** ***- Like Rods, pistons rarely need to be replaced due to wear, but a snapped timing belt will usually require new pistons. ‘e’ and ‘i’ pistons are drastically different so get the right one for your motor. There are many options for upgrading pistons; most involve upgrading the crank/rods as well, search.

Rods* ** ***- Rods rarely need to be replaced due to wear, but it does happen. Depending on your intent there are many options to upgrade M20 rods including semi-custom rods and numerous other OE BMW rods from other motors, search.

Main rod bolts** - These should always be replaced; upgraded studs are available depending on the intent of the rebuild.

Crank Main Bolts ** These should be replaced, upgraded studs are available.

Crank Rod Bearings** ***/ Crank Main Bearings** *** -These should always be replaced; upgraded coated race bearings are available depending on intent of the rebuild. BMW changed the design of the bearings in later M20’s so be sure you get the right ones.

Crank* ** ***- Cranks rarely wear out, but if you need to replace it be sure you get the correct one for your motor. There are many options to upgrade the crank, but it usually involves changing the pistons/rods as well, search.

Auxiliary/Intermediate Shaft Oil Seal – This seal was not included in my lower end gasket kit, check before you order it separately. New intermediate shaft bearings are available, but unless yours are damaged or out of spec do not remove them, they are a major PITA to replace.

Oil Pan Bolts - Not always needed, but these bolts can be 20 years old and have been known to break.

Oil Pump – Some say replacing this is not necessary, but if you don’t and it does fail you get to pull the oil pan again to replace it at best, at worst you get to rebuild the entire engine again. IMO just do it now, it’s the heart that pumps the life blood through your motor, is it worth taking a chance on a 15+ year old pump?

Intermediate Shaft Bearings - There is a myth out there that these are NLA, not true. I'm including the part numbers for the two bearings needed because they are very hard to find for some reason, at least for me.

11 11 1 264 196 - BEARING BUSH
11 11 1 280 863 - BEARING BUSH

Here is a list of the vendors that can be used in addition to the dealer to obtain rebuild parts, I will add to this list as needed.

http://www.Autohausaz.com
http://www.iemotorsport.com
http://www.pelicanparts.com
http://www.bmaparts.com
http://www.Rmeuropean.com
http://www.Carrindustries.com
http://www.turnermotorsport.com
http://www.fap99.com
http://www.bmaparts.com/index.php


For BMW part #’s refer to http://www.RealOEM.com, they have excellent diagrams for your specific car by make/model/year.

Here is a chart of BMW recommended plugs for various BMW motors including all the M20 variations.

Image

Here is a spread sheet I made that lists all the parts I researched when building my stroker, it includes prices for each part/kit from several different vendors.

http://www.e30performance.info/hostedfiles/M20%20rebuild%20parts.xls

These prices are a few years pit of date now, but this will give you a good idea of what a proper rebuild will cost you.

An engine rebuild is something you only want to do once, so do it right the first time and don’t cut corners to save a few pennies. If you can’t afford to complete the rebuild properly don’t start it until you can afford it!


If I missed something let me know and I will update this post.

Feel free to ask any questions you can’t find answers to with the search function.
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Re: Complete M20 Rebuild Parts List

Postby ten2doyle102 » Thu Mar 05, 2009 5:01 am

Nice resource for anyone doing this in the near future! Good info! :)
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Thu Mar 05, 2009 4:33 pm

Thanks, I'll keep the first post up to date, feel free to add anything I missed.
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Re: Complete M20 Rebuild Parts List

Postby joecrotch » Mon Mar 09, 2009 9:45 pm

this will be a big help with my I head stroker build thanks
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Tue Mar 10, 2009 1:56 am

no problem, I'll be adding some photos soon also.
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Re: Complete M20 Rebuild Parts List

Postby Lames » Fri Mar 20, 2009 6:30 pm

damn man, awesome list!
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Fri Mar 20, 2009 6:52 pm

Thanks, still working on pics.
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Re: Complete M20 Rebuild Parts List

Postby Court M3 » Tue Mar 24, 2009 1:40 pm

Now all we need is a price list.
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Tue Mar 24, 2009 6:03 pm

I have a price list from several vendors for all the parts covered in this thread, I just didn't post them because they change over time. Anyone can send me an email at akorcovelos@yahoo.com or PM me for the spreadsheet with prices.
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Mon Jan 03, 2011 12:17 am

bumping this since I finally added all the pics.
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Re: Complete M20 Rebuild Parts List

Postby Yoshi » Mon Jan 03, 2011 12:26 am

OMG so many pictures.
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Re: Complete M20 Rebuild Parts List

Postby ten2doyle102 » Mon Jan 03, 2011 1:16 pm

Very nice work Tony! :)
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Mon Jan 03, 2011 4:33 pm

Thanks, I really wished this had been done when I rebuilt mine, so I figured since I already did all the leg work why not put it all in one place.
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Re: Complete M20 Rebuild Parts List

Postby M20_fever » Wed Aug 10, 2011 12:15 am

Added Oil Pan bolts.
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Re: Complete M20 Rebuild Parts List

Postby Dontrusthise30 » Fri Dec 16, 2011 2:45 am

Why is it gone from e30tech? Disgruntled or just easiest way to move it? (BTW, not trying to start anything, you didn't deserve to be banned).

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