ATO

New Member

• May 19, 2007

• #1

Whats difference does it make to the cylinder head if it's 5 or 3mb?

 

Lazy Landy

New Member

• May 19, 2007

• #2

I is the number of main bearings on the crank shaft, basically a 5 main bearing is stronger cos it's got 5 instead of 3.

 

ATO

New Member

• May 20, 2007

• #3

Aye I know that.. I was wondering what difference it made to the cylinder head though. I was looking at the Turners website for recon heads and they have 3mb & 5mb.

 

Lazy Landy

New Member

• May 20, 2007

• #4

Dint knar about that, thort they would be the same

 

C

CharlesY

Well-Known Member

• May 20, 2007

• #5

Take care .... because the 5 main bearing block has ... well, FIVE main bearings to fit in the spacings of the actual cylinders may be slightly different from 3 bearing engines.

If that is so, they will require different cylinder heads and head gaskets.

Basically, the whole block is different.

CharlesY

 

ATO

New Member

• May 20, 2007

• #6

So does that mean I can't put a 3mb head on a 5mb block? or is it ok sometimes...

 

ATO

New Member

• May 20, 2007

• #7

now you've got me thinkin! if there's different head gaskets for 5mb & 3mb maybe I've got the wrong gasket on and thats causing me problems? But I ain't come across two different types of HGs

 

C

Clanger

New Member

• May 20, 2007

• #8

5mb heads are metric and 3mb are imperial and are interchangeable but you will need the appropriate bolts for anything that bolts on to it, ie rocker shaft and maifolds. You will also need the bolt for the oill feed pipe to the head.
Hope thats some help to you

 

ATO

New Member

• May 21, 2007

• #9

Cheers that does help. How do I find out if a head is metic or imperial?
Is it marked on? I've seen a decent one for sale but the owner don't know what engine it came off.

 

Sidz

New Member

• May 21, 2007

• #10

Can you measure it???

 

S

slob

Well-Known Member

• May 21, 2007

• #11

CharlesY said:

Take care .... because the 5 main bearing block has ... well, FIVE main bearings to fit in the spacings of the actual cylinders may be slightly different from 3 bearing engines.

If that is so, they will require different cylinder heads and head gaskets.

Basically, the whole block is different.

CharlesY

Click to expand...

if the spacing wur bigger then shirley the whole block would be longer? in which case yer water pump would have to be shorter , to avoid the fan going into the rad.
the mil engine which were 5ml have a different water pump so maybe thats why.