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I've got a Silvertop Zetec 1.8 from an XR2I to go in my MK4 Escort, one of the exhaust studs is badly corroded but I know if I try to remove it it will snap off, but if I leave it on it might snap off when I fit the manifold so I'm thinking of fitting a different cylinder head. Can I fit one from a 1.6? Can I fit one from 2.0? Can I fit a blacktop rather than a silvertop? Looking further ahead, does the 1.8 head mate with the 2.0 block? I gues I'm just after as much info as possible on what-fits-what? ;D..
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ChasR
RR Helper
motivation
Posts: 10,195
Club RR Member Number: 170
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Zetec interchangeabilityChasR
@chasr
Club Retro Rides Member 170
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I know it's not the answer you wanted, but how about using one of the more usual methods for dealing with a snapped stud? Heating it up before removing it, drilling it out and then retapping etc.?  . |
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mikeymk
Part of things
'85 Polo Coupe S 1.6 16v
Posts: 931
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Apr 16, 2013 19:58:29 GMT
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Knock it on the head!
These studs are usually locked by being pulled into the ally. So a clout with a hammer head-on helps to unlock the thread. You can even go at slight angles after, as long as you don't bend it.
Once the thread is shocked well, you can get some mole grips on there and flex them a degree or two in each direction to feel the thread unlock. Bit of penetrating oil can help.
That has always worked for me.
Heating can work with some things, but the expansion is best on the outside to let go, it's never worked for me with studs in a head so i'm either unlucky or just don't have the knack with a torch.
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kenb
Part of things
Posts: 604
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I've got a Silvertop Zetec 1.8 from an XR2I to go in my MK4 Escort, one of the exhaust studs is badly corroded but I know if I try to remove it it will snap off, but if I leave it on it might snap off when I fit the manifold so I'm thinking of fitting a different cylinder head. Can I fit one from a 1.6? Can I fit one from 2.0? Can I fit a blacktop rather than a silvertop? Looking further ahead, does the 1.8 head mate with the 2.0 block? I gues I'm just after as much info as possible on what-fits-what? ;D.. You've asked several different questions here, The 1600 silvertop head is a wasted exercise as the valve are smaller compared to the 1800 and 2000. So any gain from raised compression is rather lost as you cant exhaust the gases as quick. The heads are interchangeable on the like for like types so you can put a 1800 S/T head on a S/T 2000 block, obviously that raises the compression slightly. Same for B/T 1800 on B/T 2000 block. Where you may come unstuck unless you have access to machining facilities, is head swapping between silvertop and blacktops. A blacktop head will fit on a silvertop bottom, but the cam belt runs on a different path. On the B/T head there is a big core plug right where the S/T tensioner needs to be. You cant use the B/T tensioner as this fouls the water pump. So the core plug has to be welded up or bunged, then drilled tapped to take S/T tensioner. Going the other way silvertop head on blacktop bottom, you have similar problems, the water pump is now in the way of the belt run, so you have to modify the head to use the B/T tensioner. Not only that the B/T uses dished pistons, so you would lose compression. It all more aggro than its worth, so stick to complete engines or replace head like for like if I were you. |
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