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Thread: M70 head gaskets

  1. #1
    Join Date
    Sep 2015
    Location
    UK
    Posts
    35
    My Cars
    1988 BMW 750i

    M70 head gaskets

    Hi,

    I'm likely to be removing the heads from my M70 engine to investigate an excessive smoking issue and want to check on the head gasket options. I hear good things about Elring, Victor Reinz, Goetze but mixed comments for Ajusa. Does anyone have any recommendations? My current head gaskets have one hole punched in.

    Also i notice Victor Reinz list the same gasket for the M70, M73 and S70 (61-29315-00 & 61-29320-00). However, some sellers say it won't fit the M70. Has anyone used these on an M70?

    I've read the M70 rebuild threads on here so will likely strip the engine down and replace any worn parts as appropriate.

    Thanks
    Simon
    Last edited by Triggsy; 10-26-2018 at 05:20 PM.

  2. #2
    Join Date
    Jan 2005
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    Japan
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    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    Based on the ETK for one hole:
    ONLY APPLIES TO CYLINDER 1-6
    01 Cylinder Head Gasket Asbestos-Free up to 04/1990 11121731575 $170.75 ENDED
    01 Cylinder Head Gasket Asbestos-Free 1-LOCH 1,5MM up to 04/1990 11121729893
    only in conjunction with -- Timing case gasket,asbestos-free 1-hole up to 04/1990 11141725700

    ONLY APPLIES TO CYLINDER 7-12
    01 Cylinder head gasket 1-LOCH 1 04/1990 11121720076 ENDED
    01 Cylinder Head Gasket Asbestos-Free up to 04/1990 11121731652 ENDED
    01 Cylinder Head Gasket Asbestos-Free 1-LOCH up to 04/1990 11121729897 ENDED
    only in conjunction with
    01 Cylinder Head Gasket Asbestos-Free 1-LOCH up to 04/1990 11121729907
    only in conjunction with -- Timing case gasket,asbestos-free 1-hole up to 04/1990 11141725703

    So whichever gasket maker you choose, it must correspond to these numbers from BMW. Elring, Victor Reinz, Goetze seem to be the top choices.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Mar 2013
    Location
    Green Bay, WI
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    My Cars
    1992 750il / 1991 560 SE
    I went Victor Reinz, mainly because they are a repackager of OEM and don't actually make anything. So basically you are getting an OEM product at a good price that is often stamped with their name. My gaskets were 1.64mm - I do not recall if that means one or two hole. But from what you have listed above, I used the same part numbers as you.

    I purchased from AutohausAZ.com (I have bought A LOT from them in the past). They had the best prices, by far. The two I needed were AZ part number: 11121729893 (612931500) & 11121729897 (612932000). With you being in the UK, I am not sure if there would be a price advantage.

    You may also want to consider the gasket kits. This time I went with Elring. For $158 USD it was an excellent price.
    https://www.amazon.com/dp/B001G64RCY..._26725410_item

    So a short list of parts:
    head gasket 1-6
    head gasket 7-12
    head bolts (2 boxes, one box per head)
    gasket set (includes exhaust manifold gaskets and new valve guide seals)
    valley heater pipe o-rings (o-rings are for the two pipes that cross the valley of the engine front to back, from water pump to rear crossover tube)
    valley cover gasket & new bolts (stainless is a good idea)


    The valley heater pipes o-rings are not included in the gasket kit I believe. There are five o-rings needed if I recall, one being VERY tiny because it interfaces to the valley cover to let air out). Below the pipes is the valley cover. These are known to leak! The gasket is also not included in the kit. I dont have the part number handy. As you may have already read, the bolts LOVE to snap. So take great care. I pulled all mine, only had one snap if I recall. Then put in all new stainless bolts.
    ______________________________
    1992 750iL

  4. #4
    Join Date
    Sep 2015
    Location
    UK
    Posts
    35
    My Cars
    1988 BMW 750i
    Edit - link below doesn't work properly, search for BMW, 7 (E32), 1989.

    Thanks both, much appreciated.

    Those gaskets are so cheap in the US, over here in the UK they are twice the price.

    Interestingly the same part numbers on Victor Reinz website shows a different thickness of 1.75mm - see here http://ows-cdn.tecdoc.net/reinz/home...22f14a94f205fa

    And if you click on the part number and then 'linked vehicles' it states they are for other engines too. And if you click 'OE info' it gives BMW part numbers 11121702082 & 11121702083.
    Last edited by Triggsy; 10-27-2018 at 06:38 AM.

  5. #5
    Join Date
    Mar 2014
    Location
    san antonio texas
    Posts
    319
    My Cars
    1989 bmw 750il
    What is the max limit on resurfacing the cylinder heads on the M70? Ive got over 250k on my 750 and im going to replace timing chain soon. Im thinking if im in that deep I may as well do a valve job on both heads.

  6. #6
    Join Date
    Jan 2005
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    Japan
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    My Cars
    11/88 E32 750iL+98 E36M3
    cylinder head height standard size 140.0 mm
    machined limit 139.8 mm
    valves guides: not available as replacement parts
    valve guide inside dia. (installed) , standard size mm 7.0 H7
    oversize 1: mm 7.1 H7
    oversize 2: mm 7.2 H7
    max. tilt clearance "K" (wear between valve and valve guide) 0.5mm
    camshaft bearings , thrust bearings width 25.86 - 0.08mm
    bearing diameter mm 27.5 H7
    Shogun tricks and tips for the E32 series are HERE!

  7. #7
    Join Date
    Sep 2015
    Location
    UK
    Posts
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    My Cars
    1988 BMW 750i
    Hi guys,

    Not sure if this adds to the confusion or clears it up but this is the reply i got from Mahle (Victor Reinz) when querying why some sellers are listing the gasket thickness at 1.64mm

    "The part numbers you have are correct.

    61-29315-00 - cylinders 1 to 6

    61-29320-00 - cylinders 7 to 12

    We only supply one thickness and that is 1.75mm both gaskets are of fibre construction.
    This is the compressed thickness and not the thickness of the gasket when you receive it."

  8. #8
    Join Date
    Sep 2015
    Location
    UK
    Posts
    35
    My Cars
    1988 BMW 750i
    It's been a while but i thought i'd update this thread.

    I fitted a pair of the Victor Reinz head gaskets along with the following head work;

    New exhaust valve guides (inlets were ok according to the engineering shop)
    Re-cut all valve seats
    Re-ground all the valves
    Very light skim of both heads

    I reassembled the heads with new valve stem seals. I also stripped the bottom end and cleaned all the rings & pistons and re-assembled.

    The reason for doing the above was due to excessive smoke on the over run and high oil consumption. I can now report the smoke is 95% gone and the oil consumption is much improved - probably half of what it was though i haven't measured it. I didn't see the point in replacing the piston rings because the bores had a small amount of ovality and new rings may not have seated well.

    So overall i'm pleased i did the work and now the car is not so embarassing to drive.

  9. #9
    Join Date
    Mar 2007
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    UK
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    740d
    Great. I hope you can still enyoing this brutal machine. My 750iA need a lot of work (basics works), but Im using it for daily use. Awesome machine.

  10. #10
    Join Date
    Jun 2019
    Location
    Boston
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    E32, E28
    Quote Originally Posted by DavidQ4 View Post
    Great. I hope you can still enyoing this brutal machine. My 750iA need a lot of work (basics works), but Im using it for daily use. Awesome machine.
    What about fuel consumption? I am only thinking about going daily with mine but I am afraid that it will be quite expensive

  11. #11
    Join Date
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    11/88 E32 750iL+98 E36M3
    Even do not start thinking about fuel consumption, then the M70 is the wrong car, the M70 enjoys every gallon, the more the better. Owners manual says according to DIN 70 030/ 1 ECE
    at constant 90 kmh 8.9 liters/100 km, at constant 120 kmh 10.9 liters/100 kmh, city 20.8 liters/100 kmh, and that is based on a certain test cycle. In reality you will consume (much) more.
    Shogun tricks and tips for the E32 series are HERE!

  12. #12
    Join Date
    Mar 2013
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    Green Bay, WI
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    1992 750il / 1991 560 SE
    If I hyper-mile, I managed 20mpg highway but it was not easy. 18mpg highway was doable with care. Typically I managed 14 to 15 mpg average no matter city or highway. The price to pay for a vehicle that can be cruising at 70, drop the hammer and pass someone at breakneck speeds.
    ______________________________
    1992 750iL

  13. #13
    Join Date
    Jul 2009
    Location
    Richmond, Virginia
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    '88 735i, '06 RSX
    Quote Originally Posted by unity View Post
    If I hyper-mile, I managed 20mpg highway but it was not easy. 18mpg highway was doable with care. Typically I managed 14 to 15 mpg average no matter city or highway. The price to pay for a vehicle that can be cruising at 70, drop the hammer and pass someone at breakneck speeds.
    Funny, M30 gets same MPG but less torque and HP. I guess you could say only benefit is ease of maintenance vs M70

  14. #14
    Join Date
    Nov 2005
    Location
    Quebec Canada
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    92 735iL (12/1991)
    Yeah I was thinking the same youngbimmer! My 735 gets 17 L/100... I do more city than highway but still. Pretty terrible, considering the (small) amount of power

  15. #15
    Join Date
    Jan 2005
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    Japan
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    My Cars
    11/88 E32 750iL+98 E36M3
    M30 is a bit better than M70, here the data from the 1988 U.K. owners manual for 730, 750 i/iL https://750il.bmw7.hu/owners_manual/images/page_098.jpg
    Shogun tricks and tips for the E32 series are HERE!

  16. #16
    Join Date
    May 2021
    Location
    Southampton Uk
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    My Cars
    BMW e24
    Anyone know where can I get timing chain gasket please? I have a small oil leak from that small gasket.I tried in bmw dealer unfortunately it is not available anymore. Is head gasket comes together with this timing chain gasket 11141725703? If so I might purchase head gasket.01 Cylinder Head Gasket Asbestos-Free 1-LOCH from 20.04.1995 11121404497
    only in conjunction with -- Timing case gasket,asbestos-free 1-hole 11141725703
    Last edited by diegokarol; 03-28-2023 at 06:53 AM.

  17. #17
    Join Date
    Jan 2005
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    Japan
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    My Cars
    11/88 E32 750iL+98 E36M3
    11141725703 is everywhere on order backlog.
    As you are from UK, here are Engine Rebuild Gaskets/sets M70, check Vehicle Compatibility, maybe it is included https://www.onlinecarparts.co.uk/car...nder-head.html
    Shogun tricks and tips for the E32 series are HERE!

  18. #18
    Join Date
    May 2021
    Location
    Southampton Uk
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    BMW e24
    Is backlog means it will be available in future time, I just need to wait some time to order it , or it never be available to order anymore?

  19. #19
    Join Date
    Jan 2005
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    Japan
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    My Cars
    11/88 E32 750iL+98 E36M3
    not 100% clear, some shops says no longer available, order backlog, estimated delivery time unknown etc. Have a look at the picture, I assume you could be able to make your own gasket from gasket material https://www.turnermotorsport.com/p-3...uine-bmw-part/
    Guide To Gasket Paper & Sheeting
    https://www.ramgaskets.com/gasket-ma...sket-material/
    https://www.gasketing.net/gasket-material-selection/
    Shogun tricks and tips for the E32 series are HERE!

  20. #20
    Join Date
    May 2021
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    Southampton Uk
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    BMW e24
    Thank you for advice mate, very helpful ��

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