Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > 850 / S70 & V70 '96-'99 / C70 '97-'05 General

Notices

850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

Unknown hole in head of B5254T on Volvo C70 2.5T

Views : 570

Replies : 9

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Apr 30th, 2019, 15:58   #1
reise
Junior Member
 
reise's Avatar
 

Last Online: Oct 25th, 2021 11:41
Join Date: Nov 2013
Location: Magna Grecia
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, 110 views)
File Type: jpg DSC_0033.jpg (155.4 KB, 108 views)
File Type: jpg DSC_0035.jpg (180.0 KB, 109 views)
File Type: jpg DSC_0053.jpg (226.2 KB, 107 views)
File Type: jpg DSC_0054.jpg (215.5 KB, 109 views)
__________________
Volvo C70 2.5T Coupè 1998 AW50-42 Garnet Red Metallic
Mercedes-Benz CL 500 2002 Brilliant Silver
Honda CBX 550 F Candy Red and Clamshell White Pearl
reise is offline   Reply With Quote
Old Apr 30th, 2019, 17:18   #2
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 14:09
Join Date: Jun 2007
Location: L/H side
Default

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 !
__________________
My comments are only based on my opinions and vast experience .
Clan is offline   Reply With Quote
Old Apr 30th, 2019, 18:37   #3
reise
Junior Member
 
reise's Avatar
 

Last Online: Oct 25th, 2021 11:41
Join Date: Nov 2013
Location: Magna Grecia
Default

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, 99 views)
File Type: jpg B5254 Without Valve Cover.jpg (149.9 KB, 96 views)
File Type: jpg B5254 Liquid Gasket.jpg (81.1 KB, 95 views)
__________________
Volvo C70 2.5T Coupè 1998 AW50-42 Garnet Red Metallic
Mercedes-Benz CL 500 2002 Brilliant Silver
Honda CBX 550 F Candy Red and Clamshell White Pearl

Last edited by reise; Apr 30th, 2019 at 19:35.
reise is offline   Reply With Quote
Old Apr 30th, 2019, 20:41   #4
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 14:09
Join Date: Jun 2007
Location: L/H side
Default

Indeed , but it is not a seal as such but a smear of volvo liquid gasket .
__________________
My comments are only based on my opinions and vast experience .
Clan is offline   Reply With Quote
Old Apr 30th, 2019, 22:34   #5
SteveSarre
Premier Member
 

Last Online: Yesterday 09:57
Join Date: Oct 2004
Location: London/West Country
Default

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
__________________
V70 2.5 Turbo AWD Man. 1999 Red
V70 2.5 10V Auto 1998 Green
C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue
V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)
SteveSarre is offline   Reply With Quote
Old May 10th, 2019, 14:12   #6
scutyde
Retrofit master
 
scutyde's Avatar
 

Last Online: Mar 28th, 2022 11:14
Join Date: Mar 2010
Location: Berlin
Default

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.
__________________
Volvo 850 2.5 20V MY95
Pictures
Here what I retroffited so far List
scutyde is offline   Reply With Quote
Old May 10th, 2019, 18:10   #7
Cookeh
Premier Member
 

Last Online: Sep 14th, 2022 18:04
Join Date: Feb 2018
Location: Derbyshire
Default

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.
__________________
1995 Volvo 850 T5 Estate (Manual)
Cookeh is offline   Reply With Quote
Old May 13th, 2019, 15:02   #8
reise
Junior Member
 
reise's Avatar
 

Last Online: Oct 25th, 2021 11:41
Join Date: Nov 2013
Location: Magna Grecia
Default

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, 36 views)
File Type: jpg DSC00127.jpg (271.2 KB, 36 views)
__________________
Volvo C70 2.5T Coupè 1998 AW50-42 Garnet Red Metallic
Mercedes-Benz CL 500 2002 Brilliant Silver
Honda CBX 550 F Candy Red and Clamshell White Pearl
reise is offline   Reply With Quote
Old May 13th, 2019, 15:44   #9
Cookeh
Premier Member
 

Last Online: Sep 14th, 2022 18:04
Join Date: Feb 2018
Location: Derbyshire
Default

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.
__________________
1995 Volvo 850 T5 Estate (Manual)
Cookeh is offline   Reply With Quote
Old May 17th, 2019, 00:16   #10
Bigfella666
Premier Member
 

Last Online: Feb 12th, 2024 22:22
Join Date: Sep 2015
Location: London
Default

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
Bigfella666 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 17:33.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.