Fings wot broke

[AHPP]

I do get that my criticisms are largely academic. Ten thousand disc woodchippers are going to work absolutely fine at ten o'clock tomorrow morning.

[Mick Dempsey]

I guess weight and ease of manufacture is a factor as well. 
 

[AHPP]

https://vermeeruk.co.uk/blog/drum-wood-chippers-vs-disc-wood-chippers-which-is-better-

 

[PeteB]

I did a power point presentation to explain all the different types of chipper and their pros and cons. A drum is a good way to get a bigger capacity without a wide machine as a disc is over twice the width of the chipper capacity. A disc style machine has a decent amount of centrifugal forces helping to keep it going and can easily produced the puff to blow woodchips and are easy to produce and assembly where a drum may need more assembly/fabrication time and have the need for an extra blow system to blow the chips. The majority of hand fed Chippers are the disc style and yes, the bearings let go eventually, some may consider this as planned obsolescence but by the time they got a rumble on, they have done a few shifts!

[markieg31]

David brown in the surgery. Head off, had to use some ingenuity as I had to get it up and then over the loader arms which are set quite high. Ended up with rope tied of one side of the roof, down the the head and the up to a pulley the other side of the roof and then down to me. Part of the problem was getting the head up and off the long studs off the block. Once off I was hopping I would see a clear reason why I had two bent pushrods on cylinder three, nothing clear cut, no witness marks to indicate the piston had hit the valves.

[woody paul]

My old boss had a land rover fc with a Leyland 498 engine it bent a push rod once never knew what caused it, he spoke to a farmer. / engineer how ran Leyland tractors, he said he had a couple of engines that had done it and never found out why. 

 

[markieg31]

Looks to me that the valve are not very well seated, so will have a look and possibly clean it up before reassembly. 

[PeteB]

Have you over revved it! I had a couple in a Rover V8 once, same as you, no tell tale and chain hadn't slipped etc! Straighten it and lob it back together!

[Mick Jones]

18 hours ago, markieg31 said:

Looks to me that the valve are not very well seated, so will have a look and possibly clean it up before reassembly. 

 

[Mick Jones]

markieg31 it may be worth checking valve spring lengths on the bench if you have the valves out to reseat them.

      Weak valve springs could be cause of bent push rods? Possibly?

Mick.