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Forums › The Car › 206 Problems › Replacing 1.4 8v rocker cover stud |
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 Posted: Sun Aug 18, 2013 11:17 am |
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Joined: Nov 21, 2010
Posts: 515
Trade Rating: 0
Location: Oxford
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I am just about to replace this on a mates car. Anybody got any advice on how to get the stud out and put the new one in? I have a torque wrench. The old one isn't tightening and causing the rocker cover to leak and loose a lot of oil.
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Posted: Sun Aug 18, 2013 11:38 am |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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Have they been ovetightened? Sounds like it might need a new gasket as well.
What do you mean by stud? Is it a threded bar already in the block?
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Posted: Sun Aug 18, 2013 12:02 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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The only thing you can do is have a very close look at the threads and see if the damage is the stud or if it is in the head. These studs are an exact length with a shoulder that will "bottom" and put the correct pressure onto the gasket. If you tighten further the effect of the shoulder means the only thing you will do is to strip the thread.
The problem with these gaskets is people tend to reuse them rather than replace and the gaskets are rubber and go hard and crack with age so they leak through the cracks and no re-tightening will cure it especially when the design of the stud won't let any further tightening actually pull the rocker cover down, the shoulder on the stud stops that. I suspect your mate has tried to tighten the stud to seal the oil leak and in doing so has damaged the thread either on the stud, in the head, or both.
As above have a very close look and decide where the damage is.
If it is the stud then new stud, if in the head that is a bugger to fix but you can try some high strength "loctite" on the thread and just tighten the stud to the point before it goes loose again and then give the loctite a few hours to set properly before starting the engine. That is a last ditch attempt before drilling out the thread and helicoil repair.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Sun Aug 18, 2013 1:04 pm |
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Joined: Nov 21, 2010
Posts: 515
Trade Rating: 0
Location: Oxford
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The stud is the threaded bar that goes into the head and out through the rocker cover. Now it's apart it's clear the thread on the stud is f****d.
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Posted: Sun Aug 18, 2013 1:47 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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When tightening remember what I said above. As your mate has discovered it is easy to strip the thread. No point over tightening these and make sure you have a torque wrench that has a setting this low.
Torque varies depending on size of stud.
M 8 = 12ft.lb
M6 = 5ft.lb
The Haynes doesn't give the torque for the studs but I wouldn't tighten much more than the torque for the nuts and use some loctite on the stud / head threads as that will ensure the stud stays in the head when, in the future, you undo the nuts to remove the rocker cover.
NOTE: I have put a space between M and 8 as this web site automatically changes the word to "mate" if I don't put a gap. How weird is that.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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