Timing chain cover bolts size

[costellj]

Hi all. Recently purchased my Stag and going through a massive learning curve. Great to be here. Confusion I have is on bolt size for the timing chain cover and what appears to be the standard set. It appears I need different size bolts to what is sold by for example Rimmers. i.e. top right appears to require 2 / 7 eighths and not the 4 inch provided. Can anyone help or am I make a school boy error with this? Thanks

[jbuckl]

Sounds correct. 4” bolt is for alternator but recall it being even longer 4-1/2” can check tomorrow.
Your source are nearly famous for sending out incorrect fasteners, but listing them correctly.
Consider ordering fasteners from Kayfast or Spalding fasteners via eBay.

[costellj]

thanks for the response. Alternator sorted. It's the right of the 2 top bolts on the cover. It looks like it should be just under 3inch but supplied 4inch. Just wondering if the 3inch is correct and the 4inch is incorrect??

[DJT]

There are other (better?) suppliers:

https://robsport.co.uk/index.php/online-shop/shop-stag/product/5677-timing-cover-bolt-kit

[dasadrew]

James Paddock also puts together some neat kits -have used them several times - e.g. Hardtop Trim Fastener Kit.

https://www.jamespaddock.co.uk/timing-cover-boltswashers-set-2

Drew

[costellj]

Thanks all

[costellj]

FYI The James Paddock set looks spot on and as I thought. Others are providing incorrect bolt size for some areas. Thanks

[wilf]

LD parts will also make up a set for you if you ask nicely.

[Jeff]

If you get the original Triumph part numbers then you can work out exact sizes from this :

Bolt/Screw description

Examples: HB 0910, HU 0860.

First part = Two letters, describing Bolt / Screw

HB = Hexagon BoltHU = Fully threaded screw

First part of number = thickness

(Hint: Number = AF Spanner size in 1/16ths)

Number	UNF/UNC	AF
06	3/16	3/8
07	1/4	7/16
08	5/16	1/2
09	3/8	9/16
10	7/16	5/8
11	1/2	11/16
12	9/16	3/4
13	5/8	13/16

Second part of number = length - Add 50 for UNC

(Hint: Number = number of 1/8ths)

04	1/2
05	5/8
06	3/4
07	7/8
08	1”
09	1 1/8
10	1 1/4

So:

HB 0910 = UNF Bolt 3/8x1¼”

HU 0860 = UNC Screw 5/16x1¼ ”



Nb Bolt length measured from underside of head.

[dasadrew]

.... or from the Triumph Standard hardware book in the Technical Section