1991 240 PCV flame trap valve cover leak

vcowens · Post by **vcowens** » 09 Feb 2015, 18:56

Hello Everyone,

I recently bought a 1991 240. I've noticed a valve cover gasket leak near the firewall. I fully expect to find the cause to be a gunked up flame trap. My question is after I clean/change the flame trap and replace the valve cover gasket, do I need to do anything about the possible sludge build up in the motor? I've always read not to do any kind of anti sludge flush on older engines. I just want to clean what I can safely clean in order to optimize performance. Thanks.

93Regina · Post by **93Regina** » 09 Feb 2015, 21:27

vcowens wrote:1991 240....valve cover gasket leak near the firewall...

Increased blow-by pressure can bring about leaks....also, at firewall side of head, there is a plug, and if this plug is dislodged via increase blow-by, it will cause an excessive oil leak.

Besides cleaning up flametrap, inspecting that plug, and replacing valve cover gasket, I would suggest using Pennzoil® High Mileage oil, which has Active Cleansing Agents for sludge removal.

vcowens · Post by **vcowens** » 10 Feb 2015, 04:22

Great info as usual. What is that plugs function and name. Just trying to do some pre-job research online. I really appreciate all the help.

93Regina · Post by **93Regina** » 10 Feb 2015, 08:13

vcowens wrote:What is that plugs function and name.

TROUBLE

It's cheaper at the dealership: item 41
Manufacturer Part Number: 1336763

Volvo 240 244 245 Rear Cylinder Head Plug