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Main bearing caps

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Main bearing caps
#1
  This topic is about my 1974 MG MGB
fredlp Fred Pocius
Sebastian, FL, USA   USA
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1974 MG MGB "Ol Red"
Hello again guys,
Have a question regarding main bearing caps, my son pulled all the main caps off without marking any, it is obvious which are front, rear and center but the other two are the problem. the only markings on them is 18h3904 8 Q and 18h3904 9S is there a way to find which position they belong in?
Thanks Fred

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Re: Main bearing caps
#2
ErnieY Avatar
ErnieY Ernie Y
Albatera, Alicante, Spain   ESP
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1976 MG MGB GT
It's possible it will be obvious if you try to refit them to the block, if wrong there may be steps in the bores when of course they should be perfectly round.

If you can't detect any steps or apparent differences then it may come down to looking for any sign of binding on assembly, which you would do anyway of course winking smiley

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Re: Main bearing caps
#3
fast-MG.com Avatar
fast-MG.com Dave Headley
Cortez, 4 corners, Colorado, USA   USA
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#s 2 & 4 are usually stamped with the number 2 or 4 next to the bolt hole. At least on 18V engines.

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Re: Main bearing caps
#4
fredlp Fred Pocius
Sebastian, FL, USA   USA
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1974 MG MGB "Ol Red"
Thanks a million, problem solved, who would have thought the number would be under a bolt head......Thanks again.

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Re: Main bearing caps
#5
ErnieY Avatar
ErnieY Ernie Y
Albatera, Alicante, Spain   ESP
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1976 MG MGB GT
That's something I've learned today too cool smiley

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Re: Main bearing caps
#6
Speedracer Avatar
Speedracer Platinum AdvertiserAdvertiser Hap Waldrop
Taylors, SC, USA   USA
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1967 MG MGB Racecar "The Biscuit"
In reply to # 2999307 by fast-MG.com #s 2 & 4 are usually stamped with the number 2 or 4 next to the bolt hole. At least on 18V engines.



Yeppers to Dave, they are only ones marked, because those are the only two you could put in the wrong place.


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Re: Main bearing caps
#7
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dickmoritz Platinum Member Dick Moritz
Philly 'burbs, PA, USA   USA
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Dave x3. The front and rear caps are obvious, and can only go on one way, in one location. As Dave pointed out, the second and fourth caps are physically interchangeable, so it's important to note the "2" and the "4" during reassembly. Also note that caps 2, 3, and 4 are all marked "Front" to facilitate reassembly... Also, a reminder that the oil grooves on the thrust washers on the center main cap face the ends of the block, and not toward each other...

Dick


Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

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