MGB & GT Forum

Some months ago I removed these from something, not even sure it was MGB. My memory? tells me they were replaced.

They were dirty and soaked them in CLR for weeks.

I have been wondering what they're from. May not even be from MG.

Photo (4493) shows 25 the same, and two different.

The bolt heads have the number "4" stamped on them. The 25 are 5/8" long, and almost screw into a standard 1/4" nut, but thread pitch isn't right.

Ideas?

Harv,
Looks like oil pan to me.
Rut

The thread pitch is apparently UNF (fine thread) if by "standard nut" you mean a common SAE - coarse threaded one. Probably from your B, enough there to be oil pan

Oil pans have 11 or 12 bolts depending on 3 main or 5 main pan. There's too many there.

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Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains

Just drive the car and see what falls off.

Radiator, support, brackets, cooling fan?

3 main used 19 5 main used 18 1/4- 28 sump bolts I'm tired but I know it is more than 11 or 12

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LNDRVR4X4.COM
Home of Project "INCARN8'


1957 Series 1 Land Rover electric VEHICLE CONVERSION

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FIXITUPCHAP INCORPORATED

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VIETNAM 1969-1972

And some bolts for holding the gasoline tank from above (later types were different though). Another possibility would be somewhere in the bodywork, e.g. the bolts under the side panels holding the fenders. I also have some of these bolts since I own a MGB, but wouldn't know for sure either where they came from.

PS Carterpan bolts would be oily and not oxydised. Besides I feel the rings are too large for them to fit in the rim,

Not saying they are Carterpan bolts just that they are the right size if 1/4-28 fit 7/16 socket and both engines (3 main and 5 main) take more than 11 or 12 as someone stated.
Most likely radiator support bolts as there are 20 of them and 20 radiator support holes if they are 5/16-24 fit 1/2 inch socket
Math is off if the OP counted 25

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LNDRVR4X4.COM
Home of Project "INCARN8'


1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972



Edited 1 time(s). Last edit at 2014-09-01 05:32 AM by ohlord.

I didn't think any bolts on an MGB had the washer built into the head? I thought they were all regular hex head bolts with separate washers. So I'm going to say they're not from you MG, they're from you motorbike or lawnmower.

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1973 MG BGT - Harvest Gold / Black interior

1974 MG BGT - Bracken / Autumn Leaf interior - http://forum.britishv8.org/read.php?13,11702



Edited 1 time(s). Last edit at 2014-09-01 06:53 AM by MGST.

Rob x2...

Dick

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

My (old)eyeball suggests they might be M6-1.0, so not MG. Any marking on top?

Add in timing cover...

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1973 Pale Primrose Roadster. A nice 10-footer!
SUs, Datsun 5-speed

I looked up the two bolts I have in possession and which closely resemble the group of bolts in the picture above the line of the three others.

Mine has a shield with the capital letters BH in raised form on top and it is definitely coarse in thread. It very nearly fits an UNC nut, found by matching it with one of the two sides of the (UNF/UNC) bolts on the manifold. When looking towards it from the threaded part to the combined head + ring one can see the bolt is oval. Oval in the sense that a rounded off triangle is visible. In my opinion this means a bolt that is intended to be mounted by force with a kind of self-tapping and/or self-locking action. I repeat therefor my earlier remark: it may be intended to pull parts of the body structure together.

Only problem is Porter's does not list the BH as a bolt/thread type in the MGB (BSW is mentioned, but not on my bolt). Story will be continued..

PS I remember from the years I had my restoration job, one MG expert said to me he always used British type of bolts if they were present before, but others just forced metric ones in some of the locations on the bodypanels, because they entered by force anyhow. This would explain the resemblance to a M6?-1.0 bolt mentioned earlier by Dave.

I will compare it with an M6-1.0 if I possess one, or if need be with my metric tapping set (outer side taps): ended up by measuring M8-9 tapered on taps -1,25 as measured on the thread measurement tools. See also my reaction too Ernie Y



Edited 7 time(s). Last edit at 2014-09-01 03:56 PM by Donthuis.

Thanks all!

They're not from oil pan. As stated, the 25 have "4" stamped on bolt head.

I also have done no major work on my MG, Honda 600 VLS or Subaru Loyale.

My recollection is that 2 similar things were taken apart, and bolts from one used. Greasy, I cleaned these. Should have thrown these out, but decided to keep them "just in case". That'll learn me!

So great thanks, but no -one else should spend any time on suggestions.

But how could I forget taking something apart with 27 bolts?
Losing memory is frightening!