Water pump & timing cover bolt threads

ratwing

ratwing

Active Member
An easy one I hope - my thread gauges, taps & dies appear to have gone for walk so can anyone tell me what the threads are please? I don't have the old bolts so can't measure them either...
Its a p6 timing cover on a 4.6 block, the water pump bolt hole threads look like UNC ?
The timing cover bolt threads in the block, could be UNC or maybe coarse metric?
I was going to buy a bolt set but they seem very expensive, it may well be a lot cheaper to buy them seperately (retiring next month so got to start counting the pennies!)
 
They are UNC a mix of 1/4" for the waterpump only and 5/16" for the ones that secure the timing cover. There are various lengths.
 
Some are not threaded along most of the length. I'm not sure these are in any way standard. Having done this twice, I'd buy a stud kit out of sympathy.
 
Thanks for the replies, whilst looking for something else in the garage I came across a big tub of assorted UNF/UNC/BSF/Whitworth etc stainless dome nuts (I knew they'd come in handy one day!) so will use them and some stainless studding - found somewhere only a few miles away that'll do a metre each of ¼" & 5/16" for £4.50 total so it looks like a nice cheap fix.
Shell Ensis stopped the water pump bolts seizing on my old Imp estate and I've still got some left over, so hopefully the studs shouldn't stick in the timing cover again either.
 
The bolts you need:

1/4"-20 UNC - 5 off @ 1.1/8" long

5/16" - 18 UNC - 3 off @ 4.3/4" long + 1 off @ 5.1/2" long

Having said that, I converted to studding to replace the long bolts:






Stan
 
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