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Langley
Joined: 30 Jul 2013
Posts: 301
Location: Bristol
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 Posted: Wed Mar 11, 2015 18:40 Post subject: 4m40 head gasket |
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I need to buy a new head gasket. The one removed frpm.the engine has two notches on its end, the head has not been skimmed etc.
Moat places list a four notch but nowhere seems to list a two notch. Is it a mitsi only part and if so any idea of part numbers as my local dealer aren't great with import vehicle parts.
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| Posted: Wed Mar 11, 2015 18:40 Post subject: Google Ads keep this community free to join! |
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unclebazwold
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| Posted: Wed Mar 11, 2015 23:01 Post subject: |
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I robbed this info off a post by Soulman when I changed mine I was told to get the next thickness up or the four notch as I bought a new head.
Bazza
There are four different size head gaskets, part numbers ME200751 thru ME200754 sized as A, B, C and D doesn't say how thick or which one is thickest unfortunately.
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YOZA
Joined: 07 Mar 2005
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| Posted: Wed Mar 11, 2015 23:42 Post subject: |
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I used a three notch gasket as a three notch came off it, you MUST use a genuine mitsubishi part or like Carstairs you will being doing the job again next week.
Enjoy tightening those head bolts, squeaky bottom time.... :D
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blippi
Joined: 21 Jun 2010
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| Posted: Thu Mar 12, 2015 10:08 Post subject: |
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When I replaced mine I got the three notch headgasket from Mitsubishi. If I recall it was £60-80 but for a job like that I think its best to make sure it done properly.
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Langley
Joined: 30 Jul 2013
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Location: Bristol
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| Posted: Thu Mar 12, 2015 10:38 Post subject: |
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Onw I orseee has rocked up and it's a four notch... I took a two notch out of engine. Mitsi trying to tell me that. four notch is recommended replacement if engine measurements not taken. Is that right or rubbish??
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unclebazwold
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Langley
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| Posted: Thu Mar 12, 2015 10:59 Post subject: |
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Four notch sounds great :D
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Lewis
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| Posted: Fri Mar 13, 2015 12:38 Post subject: |
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Part numbers:
Gaskets thickness's are to match the set of pistons fitted. 
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Last edited by Lewis on Thu Jan 06, 2022 11:20; edited 1 time in total |
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Langley
Joined: 30 Jul 2013
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Location: Bristol
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| Posted: Fri Mar 13, 2015 13:14 Post subject: |
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Will it cause issue fitting a four notch when a two2 notch came off it? Assumed it okay and started rebuild..
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unclebazwold
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| Posted: Fri Mar 13, 2015 14:54 Post subject: |
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I was told if in doubt get the four notch out I am sure the men who really know will be along.
Bazza :D
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albideli
Joined: 02 May 2010
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| Posted: Fri Mar 13, 2015 20:44 Post subject: |
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| Ideally you measure piston heights/protrusions then use the appropriate gasket, but you'd be fine using a 4 notch on any engine |
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Green Grouch
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| Posted: Fri Mar 13, 2015 23:35 Post subject: |
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| Langley wrote: |
| Will it cause issue fitting a four notch when a two notch came off it? Assumed it okay and started rebuild.. |
A bigger notch number - eg four will not do any harm. When I did mine I had a three notch previously fitted but could not get hold of it in the timespace I had and had advice from a very good source on here that a two notch would be fine( that is thinner), I would be interested in what the difference is - especially if its mpg!!!
Don't quote me on that though ! You should be able to get the one you need if you do a bit of calling around..
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andyman
Joined: 08 Dec 2012
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| Posted: Sun Mar 15, 2015 0:14 Post subject: |
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Are the figures 0.5 and 1.0 in the final column of rows four and five of Lewis's table piston protrusion in mm? Seems quite a large variation to me, but would explain why you are safest to fit the four notch (thickest) gasket. Too thin, and your pistons could start clouting the head or valves! Too thick, you might lose a little compression and performance, but I know which I would rather risk, assuming I couldn't get the exact correct gasket!
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Green Grouch
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| Posted: Sun Mar 15, 2015 1:01 Post subject: |
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| andyman wrote: |
| Are the figures 0.5 and 1.0 in the final column of rows 4 and 5 of Lewis's table piston protrusion in mm? Seems quite a large variation to me, but would explain why you are safest to fit the 4 notch (thickest) gasket. Too thin, and your pistons could start clouting the head or valves! Too thick, you might lose a little compression and performance, but I know which I would rather risk, assuming I couldn't get the exact correct gasket! |
Andy.
I think that's piston size on dia.?
When I did mine I ordered all four gaskets on the arrangement I could send the three I didn't need back. I only got three of the sizes but measured them with a mic and the Size difference was tiny If I remember? Only a few thou on the metal section. That's why I'm interested in how much difference it has on performance and running, that's forgetting clouting anything.
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v8 rick
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| Posted: Sun Mar 15, 2015 8:03 Post subject: |
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Andy the 0.5 and 1.0 mm sizes are the piston diameter following reboring and not protrusion, as far as head gasket thickness goes the two or three notch are by far the most common types very rarely have I found a one or four notch gasket fitted.
The differences between the different sizes is minimal and I doubt very much you would notice and alteration in performance tbh .
rick.
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Langley
Joined: 30 Jul 2013
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Location: Bristol
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| Posted: Sun Mar 15, 2015 9:08 Post subject: |
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I'll let you know if its any different in a few days.
Head went back on yesterday just need to sort some other little issues then see if she runs.
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andyman
Joined: 08 Dec 2012
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| Posted: Mon Mar 16, 2015 0:18 Post subject: |
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Thanks, guys, for the clarification. Never too old to learn! 
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Langley
Joined: 30 Jul 2013
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Location: Bristol
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| Posted: Wed Mar 18, 2015 18:33 Post subject: |
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To conclude thread.
Engine rebuilt, apart from some broken bolts and a silly leak on the water pump(seal moved)
Shes back together started up well and idles nicely.
Have to retighten injector number one as it's not sealing properly.
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andyman
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| Posted: Wed Mar 18, 2015 21:24 Post subject: |
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Langley
Joined: 30 Jul 2013
Posts: 301
Location: Bristol
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| Posted: Fri Mar 20, 2015 16:15 Post subject: |
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Spoke too soon. Engine under load and glow plug extricated itself with the heli coil. Luckily didn't fire out but still scared the crap out of me.
Now have really large hole in head which upon inspection is also not at the correct angle.
New head it is then... Doh
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