Crankshaft pulley bolt

[Mdfatsi]

After rebuilding the engine I'm removing the pulley driven fan and clutch and replacing it with an electric fan. (Electric water pump as well) As you can see the crankshaft snout sticks out beyond the pulley face. The question I have is ...do I just use washers to secure the pulley to the bolt head or is there a better solution?
Thanks,

Michael
Virginia, USA

[sujitroy]

Some folks use a shorter bolt other use washers. Just noticed your auto cooler. Is it held on with 1 of these: https://rimmerbros.com/Item--i-UKC2451. There should be three of them so it can flex a little.

Sujit
CA, USA

[barkerwilliams]

I use and would recommend a shorter bolt, easy to find. There is then lots of clearance between the bolt head and the radiator to fit drive belts.

I used a Land Rover BH610281L 5/8 UNF x 3.5 90/110 front radius arm bolt.


Alan

[Carboy0]

I fitted a Revotec fan in front of the radiator as well as a 4 core radiator, which is significantly thicker than standard. The viscous fan was running at about 8mm from the radiator and after a while I could see witness marks on the radiator gills, where as the engine moved forward on its bushes under braking and the fan was brushing the back of the radiator.

When you undo the crankshaft pulley bolt to remove the fan, you will find a long spigot collar, between the centre of the fan and the crank bolt, which you are going to delete.

I can’t remember the length but if you measure the length of the bolt and separately the spigot and subtract the length of the spigot and that’s the length of the new bolt required. The thread is 5/8” UNF as previously stated by BarkerWilliams. I found it difficult to source them as most business only list up to 1/2” UNF, but I found that Namrick https://www.namrick.co.uk/ had them in stock when I called, although not listed on their website. Don’t forget to ask for a high tensile bolt.

[Peter707R]

If the crankshaft is sticking out beyond the pulley the a shorter bolt on it’s own won’t stop the pulley possibly sliding forwards/backwards on the crankshaft. Washers over the end of the crankshaft or a short section of steel tube would do the job - in conjunction with a shorter bolt, unless the tube is long enough for the standard item.

[trunt]

I use and would recommend a shorter bolt, easy to find. There is then lots of clearance between the bolt head and the radiator to fit drive belts.

I used a Land Rover BH610281L 5/8 UNF x 3.5 90/110 front radius arm bolt.


Alan

I got one of those BH610281L for my Mk1 pulley. The Mk1 power steering pulley is a bit shorter on the nose so it was still a bit too long, I'm going to get a 3" bolt. still need to find washers and spacers though, I want to keep the clutch in one piece, just in case!

Terry

[barkerwilliams]

Terry,

BMC used a standard set of numbering for hardware copied below. So perhaps you need to lsearch for a

BH610241L bolt - or whatever length you need.

Most nuts, bolts, washers and screws on Land-Rover, since Series 3, conform to a generic style part numbering system.

Alan

Prefixes:

AC = Screw, Self-tapping, Countersunk Head

AB = Screw, Self-tapping, Button Head

BH = Bolt, Hexagon Head

FB = Flanged Head Bolt

FS = Flanged Head Screw

ND = Nut, Domed

NH = Nut, Hexagon, Plain

NN = Rivnut, Nutsert or threaded collapsible sheet metal insert

NS = Nut, Square type

NY = Nut, Nyloc locking type

PS = Pin, Split Cotter

SH = Screw, Hexagon Head (Screws are fully threaded, bolts are partially threaded)

WA = Washer, Plain, Form A

WB = Washer, Plain, Form B

WC = Washer, Plain, Form C

WL = Washer, Locking

WP = Washer, Plain, Form A or special 'penny washer' size.

First digit:

1xxxxx = Metric threaded

4xxxxx = BSF threaded

5xxxxx = UNC threaded

6xxxxx = UNF threaded

Second and Third digits:

If Imperial thread, this indicates number of 1/16" of thread diameter.

On Metric threads indicates mm of thread diameter.

On self-tapping screws, this indicates the screw weight/size.

x03xxx = 3/16"

x04xxx = 4/16" = 2/8" = 1/4" or M4 or No. 4 size screw.

x05xxx = 5/16" or M5

x06xxx = 6/16" = 3/8" or M6 or No.6 size screw.

x07xxx = 7/16"

x08xxx = 8/16" = 4/8" = 2/4" = 1/2" or M8 or No. 8 size screw.

x09xxx = 9/16"

x10xxx = 10/16" = 5/8" or M10 or No.10 size screw.

x11xxx = 11/16"

x12xxx = 12/16" = 6/8" = 3/4" or M12

x14xxx = 14/16" = 7/8" or M14 or No.14 size screw.

Note how the metric dimensions are unrelated to the Imperial dimension.

Fourth and Fifth digits:

These indicate the length of the fastener.

On Imperial this is the multiple of the number of 1/8" long.

On Metric, the length is in millimetres for Set Screws, but in 5mm increments for Bolts.

xxx04x = 4/8" = 1/2"

xxx05x = 5/8" or 25mm long Bolt

xxx08x = 8/8" = 1" or 40mm long Bolt

xxx16x = 16/8" = 2" or 16mm long Set Screw or 80mm long Bolt

xxx20x = 20/8" = 2 1/2" or 20mm Set Screw or 100mm long Bolt

xxx24x = 24/8" = 3"

xxx25x = 25/8" = 3 1/8" or 25mm Set Screw

Note how the metric dimensions are unrelated to the Imperial dimension.

Last digit:

This is usually a 1 and may originally have been earmarked to specify a material or surface finish specification.

The 'L' suffix sometimes found just indicates 'Land-Rover'.

[Mdfatsi]

great bit of information thank you

[jbuckl]

Terry,

BMC used a standard set of numbering for hardware copied below. So perhaps you need to lsearch for a

BH610241L bolt - or whatever length you need.

Most nuts, bolts, washers and screws on Land-Rover, since Series 3, conform to a generic style part numbering system.

Alan

Prefixes:

AC = Screw, Self-tapping, Countersunk Head

AB = Screw, Self-tapping, Button Head

BH = Bolt, Hexagon Head

FB = Flanged Head Bolt

FS = Flanged Head Screw

ND = Nut, Domed

NH = Nut, Hexagon, Plain

NN = Rivnut, Nutsert or threaded collapsible sheet metal insert

NS = Nut, Square type

NY = Nut, Nyloc locking type

PS = Pin, Split Cotter

SH = Screw, Hexagon Head (Screws are fully threaded, bolts are partially threaded)

WA = Washer, Plain, Form A

WB = Washer, Plain, Form B

WC = Washer, Plain, Form C

WL = Washer, Locking

WP = Washer, Plain, Form A or special 'penny washer' size.

First digit:

1xxxxx = Metric threaded

4xxxxx = BSF threaded

5xxxxx = UNC threaded

6xxxxx = UNF threaded

Second and Third digits:

If Imperial thread, this indicates number of 1/16" of thread diameter.

On Metric threads indicates mm of thread diameter.

On self-tapping screws, this indicates the screw weight/size.

x03xxx = 3/16"

x04xxx = 4/16" = 2/8" = 1/4" or M4 or No. 4 size screw.

x05xxx = 5/16" or M5

x06xxx = 6/16" = 3/8" or M6 or No.6 size screw.

x07xxx = 7/16"

x08xxx = 8/16" = 4/8" = 2/4" = 1/2" or M8 or No. 8 size screw.

x09xxx = 9/16"

x10xxx = 10/16" = 5/8" or M10 or No.10 size screw.

x11xxx = 11/16"

x12xxx = 12/16" = 6/8" = 3/4" or M12

x14xxx = 14/16" = 7/8" or M14 or No.14 size screw.

Note how the metric dimensions are unrelated to the Imperial dimension.

Fourth and Fifth digits:

These indicate the length of the fastener.

On Imperial this is the multiple of the number of 1/8" long.

On Metric, the length is in millimetres for Set Screws, but in 5mm increments for Bolts.

xxx04x = 4/8" = 1/2"

xxx05x = 5/8" or 25mm long Bolt

xxx08x = 8/8" = 1" or 40mm long Bolt

xxx16x = 16/8" = 2" or 16mm long Set Screw or 80mm long Bolt

xxx20x = 20/8" = 2 1/2" or 20mm Set Screw or 100mm long Bolt

xxx24x = 24/8" = 3"

xxx25x = 25/8" = 3 1/8" or 25mm Set Screw

Note how the metric dimensions are unrelated to the Imperial dimension.

Last digit:

This is usually a 1 and may originally have been earmarked to specify a material or surface finish specification.

The 'L' suffix sometimes found just indicates 'Land-Rover'.

Brilliant system that was too.

[trunt]

That’s great.. it actually comes up in the revington TR site.

not found in the US though, I did find a grade 8 at “the bolt depot” for a few bucks

terry