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AllisG
Regular
Joined: 26 Jun 2011
Posts: 142
Location: north west,Indiana
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 Posted: Wed Sep 19, 2012 9:51 am Post subject: Replacement head bolts |
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Puting new pistons and crank in a ford 8n and I did this at my local high school and somebody stole 1 of the head bolts for the engine. But just 1 probly throw it across our shop at somebody... As for the question Is the bolts used to hold the head on a certain grade or a special bolt or can i go to the local true value and pick up a simple bulk bolt and put in the engine?
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souNdguy
Tractor Guru
Joined: 20 Aug 2002
Posts: 47741
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| Posted: Wed Sep 19, 2012 10:03 am Post subject: Re: Replacement head bolts |
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gr8 or 10 is what I would use.. might have had a 5 in it before.. but i'd go 8 min
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Dean
Tractor Guru
Joined: 29 Jan 1998
Posts: 10715
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| Posted: Wed Sep 19, 2012 11:43 am Post subject: Re: Replacement head bolts |
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If you want your replacement head bolt to be identical to the OEM bolts, you will need to get an OEM bolt at a salvage yard, as the OEM bolts are not standard.
Dean
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TheOldHokie
Tractor Guru
Joined: 08 Apr 2005
Posts: 5869
Location: Myersville, MD
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| Posted: Wed Sep 19, 2012 1:11 pm Post subject: Re: Replacement head bolts |
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| AllisG wrote: | | (quoted from post at 13:51:18 09/19/12) Puting new pistons and crank in a ford 8n and I did this at my local high school and somebody stole 1 of the head bolts for the engine. But just 1 probly throw it across our shop at somebody... As for the question Is the bolts used to hold the head on a certain grade or a special bolt or can i go to the local true value and pick up a simple bulk bolt and put in the engine? |
The OEM bolts are 7/16-14 x 2-3/8" long. A common 7/16-14 x 2-1/2" grade 8 cap screw will work just fine. Because it is slightly longer make sure it is used in one of the holes that go through into the water jacket.
TOH
Last edited by TheOldHokie on Wed Sep 19, 2012 1:13 pm; edited 1 time in total |
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Hobo,NC
Tractor Guru
Joined: 14 Jun 2007
Posts: 10611
Location: Sanford, NC
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| Posted: Wed Sep 19, 2012 5:48 pm Post subject: Re: Replacement head bolts |
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| TheOldHokie wrote: | (quoted from post at 01:11:51 09/20/12) | AllisG wrote: | | (quoted from post at 13:51:18 09/19/12) Puting new pistons and crank in a ford 8n and I did this at my local high school and somebody stole 1 of the head bolts for the engine. But just 1 probly throw it across our shop at somebody... As for the question Is the bolts used to hold the head on a certain grade or a special bolt or can i go to the local true value and pick up a simple bulk bolt and put in the engine? |
The OEM bolts are 7/16-14 x 2-3/8" long. A common 7/16-14 x 2-1/2" grade 8 cap screw will work just fine. Because it is slightly longer make sure it is used in one of the holes that go through into the water jacket.
TOH |
Are wack a 1/8 off... are use it anywhere but the manifold side of the engine....
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NOXJohn
Long Time User
Joined: 22 Apr 2008
Posts: 1262
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| Posted: Thu Sep 20, 2012 2:57 am Post subject: Re: Replacement head bolts |
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I purchased replacement head bolts from Fastenal. They were 7/16"-14X2&1/2" yellow zinc finish SAE j429 Grade 8 Hex Cap Screws Part#0115163. The was cost $0.896/each. All the head bolt holes were open into the water jacket in the three 8Ns I have rebuilt. If any hole looks blocked dig around and see if it is not just years of corrosion. I used a washer only because the head on the new bolt was not as big as the original and I liked the look. The washer from Fastenal was a 7/16" yellow zinc finish SAE Tru-Hardened flat washer Part# 1133816. The cost was $0.1912/each. I used Teflon paste seal on all bolts. I did not cut anything off any of the bolts.
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