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Hello,
The long brass tube is behind the plug on the right when you are looking at the engine from the front.
The size of the plug is 35mm and it is not the normal style of plug.
Volvo used Welch plugs or sometimes called disc plugs.
To remove any of the Welch plugs in the cylinder head or engine block EXCEPT FOR THE 4 PLUGS ON THE EXHAUST SIDE OF THE ENGINE, use a long handled punch with a sharp tip in the center of the plug and a hammer the punch straight in. Once you have about an inch of the punch inside you should be able to pry the plug out with the punch.
To avoid possible damage to the outside of the cylinders, the removal procedure for the 4 plugs on the exhaust side is slightly different. You want to place the punch off center and make a dent straight in, then using the dent as a starter, point the punch at an angle away from the center of the plug. You don't want to be too close to the outer edge either as there is a stop ring cast into the block to keep the plugs from falling inside and you don't want to break that.
To install a plug, 1st you want to thoroughly clean the inside of the opening in the block paying close attention to the sides of the openings especially near the stop ring as the plugs seal on the sides of the openings.
Coat the edge of the plug with a thin amount of sealant, preferably not silicone. We use a product made by Permatex and its called "2".
Then push the plug into the hole and make sure the plug is fully seated against the stop ring. I like to take a socket and hammer and tap gently on the socket as I move it around the outer edge of the plug to confirm that I got the plug to seat properly.
Now comes the tricky part, you need to deform the center of the plug. We use an appropriate sized socket for the size of the plug. We use a 9/16" socket for the 35mm plug. You can use the other installed plug to compare your installation.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com
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