M38a1 exhaust flex pipe

JayO · Post by **JayO** » Tue Jun 09, 2020 2:58 pm

Hello colleagues,
I have a 1970 Canadian Three M38a1 and I am working out some noises from below. My exhaust is stock and in good condition. It surprises me that the exhaust does not have a flex portion and...is not mounted on a rubber hanger. I wonder sometime if I hear a flexing exhaust system. The clamps that secure the system to the frame are currently tight and allow no movement. I thought engines move perpendicular to the length wise frame. Therefore how could exhaust be rigidly attached. I appreciate very much your thoughts. Stay safe. Jay. London Ontario Canada.

GPA · Post by **GPA** » Sat Jun 13, 2020 8:40 am

I've mounted the exhaust system with rubber hangers on M38A1. Visually, hardly noticeable.

Post by **wesk** » Sat Jun 13, 2020 9:07 am

Apparently the Willys engineers believed that the few curves and bends in the pipe would allow adequate flexing for the inch or 2 forward/aft movement of the engine.

BCA · Post by **BCA** » Thu Jun 25, 2020 9:00 am

Final adjustment of the exhaust system can be done by varying the spacer in the rear muffler clamp so that the system is in a relaxed position. Always consider that settling of old motor mounts or body to frame cushions can put stress on the exhaust system: bad news for manifold outlets.