Author Topic: Help identifying bolt (Read 8386 times)

Flim · « **on:** May 05, 2014, 06:45:34 »

I am in the process of re-installing my engine after a lengthy rebuild, and am nearing completion of re-installation. I just have the cooling system, air canister and linkages to re-install.

I need help identifying the bolt below. I can't quite figure out where it belongs but am sure I have come across it some where in the engine compartment before!

Car is a 250SL (early) with M129 manual 4 speed box (which was left in the car).

Help much needed & appreciated!

Charles

jameshoward · « **Reply #1 on:** May 05, 2014, 06:53:14 »

Distributor housing clamp?

Flim · « **Reply #2 on:** May 05, 2014, 06:59:25 »

I should have said that it's size is an M8 or possibly m10, will have to go out and measure….

Garry · « **Reply #3 on:** May 05, 2014, 07:04:39 »

I think it may be the bolt that holds the bracket for the power steering Oil reservoir at the left top of the canister in the photo.

tel76 · « **Reply #4 on:** May 05, 2014, 07:21:36 »

There is a small allen bolt like you have left over that secures the oil supply rail, the rail runs from the front camshaft tower to the rear tower, can you give us an accurate diameter ?

Flim · « **Reply #5 on:** May 05, 2014, 07:36:10 »

Eric, I know the one you mean, and I have that in place (it's an M6).

This bolt measures 32mm total length, diameter 10mm, length of threaded portion of bolt 18mm……

Flim · « **Reply #6 on:** May 05, 2014, 07:38:44 »

Garry, the power steering bracket/cylinder head bolt is an M8, and I have that secured, this one is definitely larger…..

jameshoward · « **Reply #7 on:** May 05, 2014, 07:52:28 »

Then not the dissy, as it's smaller.

Garry · « **Reply #8 on:** May 05, 2014, 10:05:10 »

There is also a slightly larger one behind the front pulley into the block but I think it has a flatter head.

Flim · « **Reply #9 on:** May 05, 2014, 11:54:50 »

Garry, yes that bolt helps locate the timing pointer and is shorter and a larger diameter (M12/14?). It seals the timing chain aperture, and I definitely have that one installed.

Hmmm……..

tel76 · « **Reply #10 on:** May 05, 2014, 20:08:02 »

It is the bolt that goes through the power steering bracket, it goes in vertically through the bracket into the ally: sump.

alchemist · « **Reply #11 on:** May 06, 2014, 02:18:48 »

The shorter Allen bolts are widely used in that engine. Check the small and the large oil pan for missing bolts. The longer Allen bolts are used in the head in front of the chain sprocket, there are 2 of them in that area.

ja17 · « **Reply #12 on:** May 06, 2014, 05:16:36 »

It is definitely an external engine bolt since the internal bolts are not cad plated. With a flat wavey washer, it most likely goes against aluminum.

Flim · « **Reply #13 on:** May 06, 2014, 05:59:21 »

Its definitely not from the oil pan, as all bolts are in place and secure, as are the bolts in the front of the cylinder head/chain sprocket area.

I too suspected that it is external & for aluminium.

I think Eric you're right, it may be for the power steering bracket to secure it to the top of the oil pan. I'll focus on this next….

Flim · « **Reply #14 on:** May 09, 2014, 10:21:54 »

I checked the P/S bracket to oil pan bolt this morning, and my mystery bolt is definitely not that one either. That bracket takes a M8 x 12mm. This bolt has a larger diameter.

There appears to be a bolt hole in the cylinder head above the water pump impeller housing between the copper banjo connector that is currently un-occupied. My previous photo's don't show this hole to have a bolt in it but it seems the right size. Is this consistent with everyone else's? (Car not fitted with A/C and is a RHD).

Similarly, on the RHS of the block, behind the water pump impeller housing and slightly above the alternator adjuster I have an unoccupied bolt hole. Is this consistent with others?

I'm still none the wiser at this stage…..

garymand · « **Reply #15 on:** May 09, 2014, 20:42:56 »

Oh! is that the hole for the FI pipe front bracket? That would be a good use for a short hex head.

Flim · « **Reply #16 on:** May 11, 2014, 19:28:11 »

No it's not that one either, I have a bolt in place there which corresponds to a pre-rebuild picture.

I wonder if this bolt doesn't belong to the bell housing? Does anyone know if any short hex bolts situated there?

66andBlue · « **Reply #17 on:** May 12, 2014, 03:36:44 »

Could it be one of the bolts that hold the grommets for the starter cable to the oil pan?
See photos here: http://www.sl113.org/forums/index.php?topic=16050

Flim · « **Reply #18 on:** May 12, 2014, 06:39:57 »

No it's too large for the oil pan bolts (which are M6x12), this one is M10…..

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Author Topic: Help identifying bolt (Read 8386 times)