Water Pump and Crank Bolt Sizes
Moderator: Fatmobile
Water Pump and Crank Bolt Sizes
Looking to replace those allen head bolts in my water pump pully and the crank pully with standard hex head bolts. Salt and time has not been good to this type of fastener. This is for an 86 Jetta 1.8L gas, but suspect that they are the same as the 1.6L diesels. Anyone know the size of the bolts for each of these? I didn't find their listing in the forum.
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- Turbo Charger
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Re: Water Pump and Crank Bolt Sizes
8x1.25, length depends.
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'91 Jetta ECOdiesel TD - clean & complete (less motor/tranny) for sale
'82 Westy Vanagon 1.9 N/A - 23.5mpg
'86 Jetta TD - 45-50mpg
'81 Dasher Wagon 1.6 N/A - 52mpg
'84 Wasserboxer - DOA, parts donor
'94 Passat wagon VR6
'03 Jetta TDI wagon 230K, 52.3mpg
'89 Jetta N/A - 51mpg
'82 Caddy 1.6 N/A - Sold
'91 Jetta ECOdiesel TD - clean & complete (less motor/tranny) for sale
'82 Westy Vanagon 1.9 N/A - 23.5mpg
'86 Jetta TD - 45-50mpg
'81 Dasher Wagon 1.6 N/A - 52mpg
'84 Wasserboxer - DOA, parts donor
'94 Passat wagon VR6
'03 Jetta TDI wagon 230K, 52.3mpg
'89 Jetta N/A - 51mpg
'82 Caddy 1.6 N/A - Sold
Re: Water Pump and Crank Bolt Sizes
Thanks. I brought an old water pump with me today and will go to the hardware store to see what fits. The length of those little bolts isnt' too long or else they hit the back side of the pump.
Everybody else lists their cars here - but not me.
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- Global Moderator
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Re: Water Pump and Crank Bolt Sizes
It doesn't seem like regular bolt heads will allow you to put a socket on them, room restriction.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
Re: Water Pump and Crank Bolt Sizes
That's all I was able to find. I picked some up and will try it. An open end should be able to grab them and turn them a bit, but we'll see. I also looked into stainless steel M8 x 1.25 x 12 allen heads, but they didn't come that short. We'll try what I got and see.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
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- Global Moderator
- Posts: 7564
- Joined: Wed Oct 30, 2002 10:28 pm
- Location: north central Iowa
Re: Water Pump and Crank Bolt Sizes
You don't have a Fastenal store nearby?
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
Re: Water Pump and Crank Bolt Sizes
Yea, there's a Fastenall store here in town. I've used them in the past, but didn't think about it this time.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
Re: Water Pump and Crank Bolt Sizes
I've ordered lots of bolts and stuff from these guys, they are great for metric stuff.
Here's grade 12.9 allen* head bolts, M8x1.25 in varying lengths
https://www.belmetric.com/8mm-coarse-an ... 2_956.html
Here's grade 12.9 allen* head bolts, M8x1.25 in varying lengths
https://www.belmetric.com/8mm-coarse-an ... 2_956.html
Last edited by EcoTX on Mon Dec 23, 2013 10:43 pm, edited 1 time in total.
Re: Water Pump and Crank Bolt Sizes
Thanks for the responses. I used a hex head M8 x 1.25 x 12 bolt. The socket just fits on the head, or fits mostly to get it snugged up. I could have gotten the 16mm long bolt and used a couple washers under the head, but this is good for now.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count