Cylinder heads for 1.8, replace, fix, or upgrade? |
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Cylinder heads for 1.8, replace, fix, or upgrade? |
Hine62 |
Sep 11 2013, 02:36 PM
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#1
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Member Group: Members Posts: 132 Joined: 4-October 12 From: Binghamton, NY Member No.: 15,000 Region Association: None |
When we tuned up the valve gaps I noticed that one of my exhaust ports studs was fixed using a heli-coil. Of course that coil needed to be replace because it pulled out, then when tightening the other side of the same port I noticed the hole the stud was in was cracked, and of course it broke. I tired JB weld but that didn't work.
So my question is... can this problem be fixed, or should the heads be replaced (new or used?), or is there an upgraded head? I'm assuming the engine will need to be pulled out to take the heads off. |
Dave_Darling |
Sep 13 2013, 09:37 AM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Note that the new AMC heads from Spain have decent castings, but not so great hardware. The general procedure with them is to replace pretty much everything but the basic casting when using them. I don't remember if the seats and guides were part of the stuff that should be replaced, but I wouldn't be surprised if they are.
--DD |
r_towle |
Sep 13 2013, 10:46 AM
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#3
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Custom Member Group: Members Posts: 24,588 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Note that the new AMC heads from Spain have decent castings, but not so great hardware. The general procedure with them is to replace pretty much everything but the basic casting when using them. I don't remember if the seats and guides were part of the stuff that should be replaced, but I wouldn't be surprised if they are. --DD Just curious. Have there been documented cases of failures of the new heads, bolted on right out of the box? Rich |
Jake Raby |
Sep 13 2013, 07:59 PM
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#4
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Note that the new AMC heads from Spain have decent castings, but not so great hardware. The general procedure with them is to replace pretty much everything but the basic casting when using them. I don't remember if the seats and guides were part of the stuff that should be replaced, but I wouldn't be surprised if they are. --DD Just curious. Have there been documented cases of failures of the new heads, bolted on right out of the box? Rich Yes, look no further than thesamba to see them. I have been bitten by them as well, having lost a retainer on a stock engine using a stock cam in a bus application. The retainers are junk and the keepers pull through them. Thats among the random deficiencies with every other aspect of their factory hardware. I don't even consider using more than just the head castings from these. |
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