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Unknown hole in head of B5254T on Volvo C70 2.5T

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Old Apr 30th, 2019, 14:58   #1
reise
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Default Unknown hole in head of B5254T on Volvo C70 2.5T

Hello.

Under the engine spark plug cover, there is a large hole with two small threaded holes close to it.
When I bought my C70 the hole was empty and dry.
I show this hole in the next photo.
The photo dates back to 2012.



In 2014 the water cooler started to have a small liquid leak. I should have immediately replaced the radiator, but I used it for another year and a half. Then the water loss from the radiator was increased.
So I bought a new radiator and with the occasion I had the head gasket, distribution kit, other work replaced. However from that moment engine oil started to come out of that hole that was once dry.
I show this hole in the next photo.
The photo dates back to 2016.





The mechanic did not want to take responsibility for the damage.
And instead he "solved" the problem by plugging this hole, to my great disappointment. I haven't had engine oil leaks since then, and the car works great, but I don't know if this was the right solution.
What is this hole for?
I show this hole in the next photo.
The photo dates back to 2017.



Attached Images
File Type: jpg Hole B5254T Head.jpg (170.0 KB, 109 views)
File Type: jpg DSC_0033.jpg (155.4 KB, 107 views)
File Type: jpg DSC_0035.jpg (180.0 KB, 108 views)
File Type: jpg DSC_0053.jpg (226.2 KB, 106 views)
File Type: jpg DSC_0054.jpg (215.5 KB, 108 views)
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Old Apr 30th, 2019, 16:18   #2
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I would say whoever did the head job did not put any volvo sealer around the cam cover under where the hole is , If it is dry now they did a good repair which saves a big job of taking off the cam cover again . The hole is for equipment for other markets. It isn't a hole it should not go anywhere !
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Old Apr 30th, 2019, 17:37   #3
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Now I understand. So he forgot to put the seal behind the hole? In the next photo you can see the back of the hole (surrounded in red).



Until now all the photos posted are from my C70. But the next 2 I will show I took from the internet as I have no photo of the engine without a valve cover.
Next photo is engine without valve cover (from internet).



Next photo is engine without valve cover and liquid gasket apply well (from internet).

Attached Images
File Type: jpg DSC_0012.jpg (256.6 KB, 98 views)
File Type: jpg B5254 Without Valve Cover.jpg (149.9 KB, 95 views)
File Type: jpg B5254 Liquid Gasket.jpg (81.1 KB, 94 views)
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Last edited by reise; Apr 30th, 2019 at 18:35.
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Old Apr 30th, 2019, 19:41   #4
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Indeed , but it is not a seal as such but a smear of volvo liquid gasket .
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Old Apr 30th, 2019, 21:34   #5
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Hello Reise,

I don't know about that hole.

Did you ever find the cause and the solution to the suspension problem that you asked about in February 2019?

https://www.volvoforums.org.uk/showthread.php?t=291280

Steve
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Old May 10th, 2019, 13:12   #6
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The hole is for the optional secondary pulsed air system . A metal pipe is attached to it an blows fresh air into the the head. The lower half is different in this setup so that that the air reaches the exhaust gases and causes an "afterburn". The point is to heat up the catalytic converter faster so to improve the overall eimisions.

Normaly the hole is empty on cars with no PAIR system and no oil should come out of it.
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Old May 10th, 2019, 17:10   #7
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Quote:
Originally Posted by scutyde View Post
The hole is for the optional secondary pulsed air system . A metal pipe is attached to it an blows fresh air into the the head. The lower half is different in this setup so that that the air reaches the exhaust gases and causes an "afterburn". The point is to heat up the catalytic converter faster so to improve the overall emissions.

Normally the hole is empty on cars with no PAIR system and no oil should come out of it.
This is spot on. There is also zero reason to plug it. If you have oil beneath your spark plug cover you either have (or had, depending on its colour) a bad PCV system, or your oil filler cap gasket needs replacing. In my case it was the latter.
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Old May 13th, 2019, 14:02   #8
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I had a new PVC kit installed and a new oil cap gasket installed. But from that hole the oil came out anyway. I believe that the oil leaked from that hole for a bad valve cover replacement by the mechanic, who then resolved with that nut shown in the photo.
The secondary air injection system in which international markets was expected?

I post a picture of secondary air injection system (picture taken from internet):





This system is good to reach quick optimal temperature of work in cold climate?
Attached Images
File Type: jpg DSC00125.jpg (229.6 KB, 35 views)
File Type: jpg DSC00127.jpg (271.2 KB, 35 views)
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Old May 13th, 2019, 14:44   #9
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USA was the main market. A few of the EU countries with stricter emissions laws got it. The SAS primary 9urpose was to decrease emissions at startup/cold by increasing exhaust gas temperature and bringing the catalytic converter up to operating temperature faster.
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Old May 16th, 2019, 23:16   #10
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Presumably so that Trump who could have made a real difference to the levels of emissions on this soon to be destroyed planet could turn round and ask / say " who cares anyway "

The philosophy of the yanks really does make me chuckle

Suprised Their equivalent of thEir MOT test does not require emisssions to be. Tested next to a smelting plant

Answers on a postcard please
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