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head off a12 |
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Just can't stay away  
Joined:
2007/3/2 1:08
From wangaratta vic australia
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Registered Users
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ive just pulled the head of my 120y (suspect head gasket) just would like to know that when i put it back 2gether ,do i need to use new head bolts , and do i need to readjust the tappets! thanx
Posted on: 2007/3/21 5:21
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Re: head off a12 |
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No life (a.k.a. DattoMaster)  
Joined:
2003/6/27 14:53
From Southern Tablelands N.S.W. Australia
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Registered Users
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Quote:
spark79 wrote:
do i need to use new head bolts , and
do i need to readjust the tappets!
thanx
No Yes
Posted on: 2007/3/21 6:42
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Re: head off a12 |
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No life (a.k.a. DattoMaster) 
Joined:
2004/5/4 8:32
From Canberra
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If the headbolts are pitted with rust then replace them. You wouldnt want to snap one when retensioning them would you?
Posted on: 2007/3/21 16:18
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Re: head off a12 |
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No life (a.k.a. DattoMaster) 
Joined:
2003/9/2 6:01
From SE Melbourne
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Registered Users
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How do you adjust tappets (pardon my ignorance).
Don't they just sit in their bores and get pushed when the camshaft pushes them?
I know about adjusting valve clearances....just can't think of anyway to adjust tappets...
Posted on: 2007/3/21 17:33
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Mildman, Datsunless
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Re: head off a12 |
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No life (a.k.a. DattoMaster) 
Joined:
2003/2/10 5:17
From Freo
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valve clearences are the same thing.. tappets is a term for rockers.. 
Posted on: 2007/3/21 19:02
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Re: head off a12 |
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No life (a.k.a. DattoMaster) Joined:
2003/9/2 6:01
From SE Melbourne
Group:
Registered Users
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Ok - in the Datto workshop manuals they use tappet to mean lifter....the thing between the actual camshaft and the push rod.
Rocker arms is a whole different story and I understand how and why to adjust those.
Ah learn something new every day...
Posted on: 2007/3/22 1:19
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Mildman, Datsunless
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Re: head off a12 |
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No life (a.k.a. DattoMaster) Joined:
2003/6/27 14:53
From Southern Tablelands N.S.W. Australia
Group:
Registered Users
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The terms 'tappet, lifter, & cam follower' are all used to describe the same thing & to 'adjust the tappets' is an industry phrase that usually translates to 'adjust the valve stem to rocker arm clearance' [OHC engines excepted]
Yeah, I know, why can't they say exactly what they mean.
Posted on: 2007/3/22 2:20
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Love your Datsun.
Treat it well.
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Re: head off a12 |
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Just can't stay away Joined:
2007/3/2 1:08
From wangaratta vic australia
Group:
Registered Users
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if i were to port polish, shave the head ect, how much power would i likley to gain?
Posted on: 2007/3/22 4:30
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Re: head off a12 |
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Home away from home  
Joined:
2005/9/5 14:02
From Bunbury Western Australia
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Registered Users
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by porting the head it won't make any extra power but will allow for more power to be made with bolt on's and a camshaft, basically if you had all the performance goodies bolted to your engine it will still only make as much power as the head can flow, so by porting the head you will now be able to build power from there on
Posted on: 2007/3/22 4:39
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Two things that drive me nuts.....a dry road under a grey sky and a wet road under a blue sky, because no matter what, it's either too soon or too late to drive the way I want
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Re: head off a12 |
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Just can't stay away Joined:
2007/3/2 1:08
From wangaratta vic australia
Group:
Registered Users
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ive got extractors to go on,and a 2.5"exhaust,not sure if that will make a difference? i had it on the dyno b4 i mucked around wif it and it put out 34.1kw, i would like around 60-70 kw
Posted on: 2007/3/22 4:43
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