k9unit Posted May 6, 2008 Share Posted May 6, 2008 what would cause a rocker sharft to brake on a 300 tdi and a push rod to brake pr Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted May 6, 2008 Share Posted May 6, 2008 Piston hitting the valve, without a doubt. I would have a look at your cambelt before it breaks and takes all the pushrods with it. It may have jumped a tooth which caused the piston to hit the valve. I assume your pushrod is bent, I can't see one ever breaking. The rocker shaft is a known weak point on the 300Tdi, sometimes the threads strip out on the bolts that hold it down and the shaft will quickly break. I mean, who designed the shaft to have three big holes in it? The Land Rover tea lady strikes again. Quote Link to comment Share on other sites More sharing options...
k9unit Posted May 6, 2008 Author Share Posted May 6, 2008 cheers mate pr Quote Link to comment Share on other sites More sharing options...
Ooops Posted May 6, 2008 Share Posted May 6, 2008 cheers matepr Hi, hope you don't mind me chiming in, its my first post after a long lurk Several years back I put my 300tdi in for a service at the local LR agent and after went into part of the desert for a jolly. We were a good way through when the truck packed up and wouldn't play. We took the rocker cover off and found that a number of the posts were really loose which allowed the shaft to flex resulting in the pictures below. The tightest of the rocker posts whilst loose were still in place and could be tightened down but for the others the movement of the bolts had elongated the threads in the head. Using strands of nylon rope to take up the slack and pack out the elongated threads the remaining bolts were were very gingerly tightened down. Long story short we put it all back together lining every thing up as best we could and drove it out of the desert and several hundred kilometres home. When we got back I stripped it down and found no damage other than some of the rods and their corresponding cam followers. The only conclusion that I came up with was that the posts had been loosened during service and not properly torqued down after but I can't begin to imagine why they'd do that. I do all my own work now! HTH Olly Quote Link to comment Share on other sites More sharing options...
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