4 mix broken cam follower ...

[lilspenny]

Ever heard of such? All I can say is that a violent ending... Root cause unknown. After the death I looked under the cap at the rocker arms and my exhaust pushrod was awol. Tried turning the blower upside down and that did no good. Repeat. No good. The blower was under warranty and Stihl replaced the machine with a new one. Thanks, Stihl. I went to my dealer, H&R Agri-Power in Tanner, AL to pick up my new blower and inspect my defective blower and holy smokes the cam follower was broken in half. The whole lower half of the exhaust cam follower was in several pieces. The cam lobe was scarred. Both valves freely moved. Apparently the pushrod came loose, got all tangled in the cam follower and jammed the whole thing. My first thought was a hanging valve but not so. Anyone ever heard of this type of 4-mix failure?

 

[oddsaws]

I had a BR550 that this happened on. The push rods aren’t held in place by much. The cam seemed very brittle.

New cam and push rod and good to go again.

 

[lilspenny]

I had a BR550 that this happened on. The push rods aren’t held in place by much. The cam seemed very brittle.

New cam and push rod and good to go again.

Interesting. I was told they won't attempt repair on such... I guess since the cam follower was demolished

 

[oddsaws]

Interesting. I was told they won't attempt repair on such... I guess since the cam follower was demolished

Yeah it definitely shouldn’t have failed within the warranty period. That might be the standard for a claim

 

[lilspenny]

Yeah it definitely shouldn’t have failed within the warranty period. That might be the standard for a claim

Well, I'm glad they did.