Mudmonkey Posted April 10, 2013 Share Posted April 10, 2013 As some of you will know I bought a 300tdi auto disco from another member on here as he was having troubles with the coolant pressurising and got it diagnosed as having a cracked head. I set about stripping the head off the engine finding that the rocker shaft was snapped into three pieces on the way, I've heard this is a common problem on the 300 as they're made from cheese. With the head removed it was visible that there were long cracks from the glow plug holes as well as cracks between the injectors and the inlet/exhaust ports, to me this is evidence enough that its new head time without getting it tested to see the condition of it internally. Anyway that's as far as I've got as I'm working in Dublin with the disco being over at home in Yorkshire so time spent with it is pretty limited at the moment. I'm going to be ordering the bits to get the job done this week and have been looking at Tuner Engineering, they have new normal and performance heads and I was wondering if the extra money for the performance head is really worth it? Any comments or suggestions are appreciated. Quote Link to comment Share on other sites More sharing options...
muddychris300tdi Posted April 10, 2013 Share Posted April 10, 2013 Hi, I have a tuner performance head. I fitted it along with a full size intercooler and a few other bits. So I cannot say if the head alone gives great increases of power. I've never had it on a rolling road or had chance to put it along side a standard 300tdi. I think it helps and my friend says he's never been in a 300tdi like it. Sorry not much help. Quote Link to comment Share on other sites More sharing options...
Mudmonkey Posted April 13, 2013 Author Share Posted April 13, 2013 What other bits did you fit with the head apart from the intercooler? I was going to de-cat and de-EGR it while I've got most of it disassembled anyway as well as make up a little tuning box similar to the EVRY mod box as the truck is EDC. Quote Link to comment Share on other sites More sharing options...
muddychris300tdi Posted April 13, 2013 Share Posted April 13, 2013 I removed egr valve, fitted kenlowe fan, removed standard air box for a enclosed carbon type, moved the pipe that runs from the turbo to the injection pump to the inlet manifold, fuel pump tweaks, turbo up to 18 psi and straight through exhaust. Quote Link to comment Share on other sites More sharing options...
Lars L Posted April 14, 2013 Share Posted April 14, 2013 I bought one when my headgasket went. There is no dramatic increase in boy racer power, but the engine gets a lot stronger at lower revs, especially uphill on small roads. Hills that previously needed 3rd gear could be driven in 4th because of the inreased torque. I would gladly spend extra for a performance head again... Quote Link to comment Share on other sites More sharing options...
CJ1 Posted May 27, 2013 Share Posted May 27, 2013 Oh my god, this post really upsets me Not because a member has posted it, but because I had no idea how bad the problems were, I had no idea things were that bad, and yes as other members will realise, it was bought from me as a non runner after I got shafted by a mechanic who conned me into this Discovery which is why I sold it on as spares or repairs. I really hope that it can be repaired and put back on the road as I spent a lot of money on it and lost a lot more. If you were local I would help with the rebuild. Hope you get it sorted. Quote Link to comment Share on other sites More sharing options...
o_teunico Posted May 30, 2013 Share Posted May 30, 2013 the engine gets a lot stronger at lower revs (...) because of the inreased torque Whas just a head swap or did you tuned the IP and turbo? Quote Link to comment Share on other sites More sharing options...
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