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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Cylinder head slightly pittedViews : 596 Replies : 10Users Viewing This Thread : |
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May 19th, 2022, 02:42 | #1 |
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Cylinder head slightly pitted
Hi folks,
I drive a 940 Polar SW, B200FT of 1997 - 283000 Km and my head gasket had to be replaced. So I removed everything and took the cylinder head to resurface. Now, I have only one big issue left, there is a point that is pitted, and I need advice on the best way to repair it. Please see some images below, no need to circle the small pitted area in photo #1: Some people suggest to use stuff like JB-Weld metal, but I think I need another level of professional welding here, it has to last at least another 25 years (in the meantime I will make it electric) Your advice is always appreciated. Thank you! Alex
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940 Polar 2.0L Turbo SW - B200FT - 1997 XC 70 2.5L SW - 2006 |
May 19th, 2022, 06:53 | #2 |
The Brit Brick
Last Online: Aug 13th, 2023 09:39
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Location: Warwickshire
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That needs building up with weld and machining back.
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy. |
May 19th, 2022, 07:44 | #3 |
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Last Online: Apr 21st, 2024 14:28
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Location: Lenzie
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Looks like watermarks to me. If it's been skimmed flat ( as it should've been ) it will be fine in that area.
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
May 19th, 2022, 09:24 | #4 |
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Hi
That area of pitting is where there is a hole in the gasket which allows the coolant from the block to contact the cylinder head. This is quite common and shoudn't be anything to worry about in your case. Looking at your first photo, there seems to be a blemish under the intake valve of number 3 cylinder. Is this oil/grease or something? If it's a ripple in the aluminium I would worry more about that as it is where the cylinder gasket will sit. Tim |
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May 19th, 2022, 09:24 | #5 |
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Hi
I have just done my head and it was much worse than that it will be fine the reason it happens is not enough antifreeze |
May 19th, 2022, 10:00 | #6 |
Go redblock or go home
Last Online: Today 16:52
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Location: UK
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As the others have said it is very common on these cylinder heads and is nothing to worry about. I had a patch like that on my 531 head still after I got it skimmed and it has been absolutely fine for about 10k miles now.
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May 19th, 2022, 16:30 | #7 |
The Brit Brick
Last Online: Aug 13th, 2023 09:39
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It is well away from any oil or coolant galleries, so theres a good change it would never cause a problem.
Conversely, I built race engines for a living for near on 40 years and if it were mine I'd ert it sorted on the basis that its only a few hundred quid to fix, so theres not a compelling financial argument for taking even a slight risk with it.
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy. |
May 20th, 2022, 15:04 | #8 |
Trader Volvo in my veins
Last Online: Yesterday 23:53
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Location: Anglesey
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Not at all. It is only very minor. It is only once the pitting is getting close to other things you need to worry about it There is no reason to do anything with it other than fit it and enjoy driving |
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