check out my crack |
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check out my crack |
mightyohm |
Nov 12 2003, 12:51 AM
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#1
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
Cylinder head crack that is.
Is this the fatal exhaust valve to port crack? Attached image(s) |
mightyohm |
Nov 12 2003, 12:52 AM
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#2
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
closer
Attached image(s) |
mightyohm |
Nov 12 2003, 12:53 AM
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#3
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
the usual spark plug hole cracks.
Attached image(s) |
mightyohm |
Nov 12 2003, 12:55 AM
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#4
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
The other cylinder on this head has the same exhaust port crack.
Are these heads too far gone, or can this be fixed? Oh, and another thing. See the ridge inside the combustion chamber around the outside edge? That's not a head gasket or a shim. It's in the shape of the combustion chamber! |
mightyohm |
Nov 12 2003, 12:59 AM
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#5
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
Head
Attached image(s) |
redshift |
Nov 12 2003, 01:08 AM
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#6
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
I have had ones that appeared to be worse fixed, I am no expert on the matter bny any means.
M |
Brad Roberts |
Nov 12 2003, 02:06 AM
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#7
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Yep. I touched his crack. Hopefully The Jakester will see this and comment.
B |
john rogers |
Nov 12 2003, 08:13 AM
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#8
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
I had much worse on my stroker motor and they were repaired. You need a shop that can heat the aluminum, then match the metal composition of the casting and then releive all welding stresses so that when all is finished you can't even tell it was repaired.
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Red-Beard |
Nov 12 2003, 08:16 AM
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#9
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"Ya canna change the laws of Physics" Group: Benefactors Posts: 1,124 Joined: 11-February 03 From: Houston, TX Member No.: 288 Region Association: None |
I know Motorwerks can do it in San Diego, but then you don't live here any more...
(IMG:style_emoticons/default/cool_shades.gif) |
skline |
Nov 12 2003, 08:19 AM
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#10
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
I had a set that was way worse than those. The PO had run the car for about a year with a blown head gasket. It destryed the head but Rimco fixed it. The cylinder wall had eroded away so you can imagine what the head looked like. When I got it back from Rimco, you could not even tell.
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mightyohm |
Nov 12 2003, 10:35 AM
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#11
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
I'm hoping Jake will comment too. I know that sometimes cracks into the exhaust port can't be fixed because of limited access into the port.
PS: Yes, Brad touched my crack. And it was good. |
Britain Smith |
Nov 12 2003, 11:53 AM
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#12
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
I am going to the guy at the machine shop in San Jose today and I can make reference to the size of your crack to him if you would like. He can weld Aluminum and I know he repairs 912/356 Heads with cracks in them. As for the spark plug cracks, he fixed those on my heads.
-Britain |
mightyohm |
Nov 12 2003, 12:38 PM
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#13
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
I don't have dimensions, but as you can see it extends from the valve all the way to the edge of the combustion chamber. I don't know if it is showing through on the exhaust side.
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Britain Smith |
Nov 12 2003, 01:46 PM
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#14
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
I just talked with Jay...the machine shop in San Jose...and he said he can fix the crack when re-doing the heads for an additional $75 per cylinder that is cracked.
-Britain |
mightyohm |
Nov 12 2003, 03:15 PM
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#15
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
Britain - That sounds good. I'd like to have Jay take a look at them. Are you going back again anytime soon?
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Britain Smith |
Nov 12 2003, 03:23 PM
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#16
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
I will go down there to pick up some stuff on Friday...PM me offline and we can working something out.
-Britain |
Brad Roberts |
Nov 12 2003, 03:34 PM
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#17
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Keyzer,
I may want to lump your heads in with the 4-5 2.0 sets I currently have for the machine shop. This may yield a slightly lower cost for having all of them done at the same time. B |
Britain Smith |
Nov 12 2003, 03:43 PM
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#18
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
And they can all get done within a reasonable time frame.
-Britain Let me know how many people are going to get in on this and I will let Jay know so he can pre-plan. |
anthony |
Nov 12 2003, 08:22 PM
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#19
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218 |
Brad, when are the heads going to the machine shop? I got set I'd like to get done.
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Brad Roberts |
Nov 13 2003, 01:01 AM
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#20
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
I have two more engines to pull apart this weekend. I would like to send them to the machine shop at the end of next week.
B |
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