munst Posted March 19, 2010 Share Posted March 19, 2010 Alright gents, I've posted this at a couple of other sites - really desperate for any advice! Going round a round about on the way home last night all of a sudden the engine sounds like a drum kit. No sudden juddering or engine stalling it just starts making a loud (bloody loud) bang and looses power. Pull over, stop engine pop bonnet to have a quick check, no oil lost, oil light didn't come on, no pool of anything under it, no visible external damage, nought. So start it up, starts first time but still with the bloody horrible banging, ticks over really slow and un-even (about 500rpm). So figure its fecked and ring the AA etc. Anyone ever had to do a big end on a 300tdi? Rang me local indy this morning and the guy didn't want to quote for anything other than a couple of hours labour to see what's really happened (understandable). Do-able with the engine in? Just sump off job etc? Cheers lads. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted March 19, 2010 Share Posted March 19, 2010 Yep, sump off/ oil strainer off to access the big ends and some of the mains. Big ends knock when under load - pulling away, labouring in a high gear up a hill. Mains rumble all the time, so there's an identifiable difference between the two. The sump is glued on with RTV sealant, so takes some patience to get it off with a paint scraper or similar sharp bladed object. If the big ends are gone, then it might be too late to just replace the shells - the crank journals may be damaged/oval. Les. Quote Link to comment Share on other sites More sharing options...
cipx2 Posted March 19, 2010 Share Posted March 19, 2010 I don't think it's the big end or mains. A damaged big end or main bearing would explain the noise but not the power loss. On the other hand, big ends bearings going out of the blue is not common on 300tdis, only 200tdis. More likely something wrong on the top end. You can start by inspectng under the rocker cover. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted March 19, 2010 Share Posted March 19, 2010 Was going to say check the brake pump,but they dont normally cause power loss,best remove the rocker cover and start there..... Quote Link to comment Share on other sites More sharing options...
munst Posted March 19, 2010 Author Share Posted March 19, 2010 Ok cheers gents, I'll take the rocker off and check the rockers etc. Thing that makes me think it's bottom end is the loudness and clean-ness (if that makes sense) of the banging, it sounds like a .410 shotgun! Quote Link to comment Share on other sites More sharing options...
fender1234 Posted March 19, 2010 Share Posted March 19, 2010 isnt snapped rocker shaft a common 300tdi problem, might be worth a check as its quick and simple. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted March 19, 2010 Share Posted March 19, 2010 Yes - after a snapped cambelt as far as I'm aware. I don't know if the shaft makes any noise though as it doesn't move at all. Les. Quote Link to comment Share on other sites More sharing options...
DiscoGlover Posted March 20, 2010 Share Posted March 20, 2010 possibly something to check, as i thought i had lost my bottom end, take off the auxiliary belt, fan belt, power steering belt, whatever you want to call it and check for play in your bottom crank pully, and all the others whilst your there it probably isnt that but its a 2 minute check Quote Link to comment Share on other sites More sharing options...
matt bristol Posted March 20, 2010 Share Posted March 20, 2010 I'd definately check the top end first,I had a stud pull out that holds the rocker assembly and that made an almighty banging noise with loss of power miss fire etc - however it did p*** oil out the rocker cover too. Injector pump over injecting perhaps? Quote Link to comment Share on other sites More sharing options...
boiler man Posted March 21, 2010 Share Posted March 21, 2010 i had a pajero once ( IM SORRY!! i will repent!!) and number one piston was smacking the cylinder head,dont know why cos i scrapped it after an astronomical quote to repair, only just 'kissing it' apparently, but sounded JUST like a 410 shotgun! Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted March 22, 2010 Share Posted March 22, 2010 The 300 (not 200) tdi has a magnificent oil pump and big-end problems are rare. Normally even reconditioned engines only require a polish of the journals and not a regrind. I have reconned something like 5 300tdis and none of them have needed a crank grind of any sort. Bore wear, yes, valve and seats have to be reground/renewed, but the bottom end seems bulletproof. I would reckon something has gone wrong at the top end of the engine, although taking the sump off a 300 (not 200) tdi is easy. Think of it this way, if you are going to have to take the pistons and rods out you will need to take the sump off anyway. So do that for a start. Quote Link to comment Share on other sites More sharing options...
munst Posted March 28, 2010 Author Share Posted March 28, 2010 Afternoon all! Thanks for all the advice gents - finally just got round to taking the rocker cover off to have a look. The adjuster on number 8 tappet (closest to the bulkhead) had snapped, the bell shaped bottom of it that mates with the top of the push rod has literally snapped off. The push rod is now loose (as in I can freely wiggle it with one finger and pull it up/down with no resistance at all, is this to be expected with no pressure on it?). I'm unsure if this is the cause of the effect if you catch my meaning, the push rod is so loose it wouldn't surprise me if it was snapped. Anyone have any tricks of the trade for removing the bottom half of it if it has snapped? Cheers! Quote Link to comment Share on other sites More sharing options...
fender1234 Posted March 31, 2010 Share Posted March 31, 2010 Magnet Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 1, 2010 Share Posted April 1, 2010 Seems likeley that it's your problem - the valve won't be opening. The tappet adjuster can be bought as a seperate item. You'll need to remove the rocker assembly to replace it as it only screws in from the pushrod side. If the pushrod appears damaged (and it may still be fine), then replace that as well and reset the tappet gap (make sure the valve cap is still there as well. Part number for the tappet adjuster is - ERR4883 - 'Screw - Engine tappet adjuster' Les. Quote Link to comment Share on other sites More sharing options...
octo0072000 Posted August 19, 2011 Share Posted August 19, 2011 could also be cambelt jumped a couple of tooth that will cause the rocker shaft to brake bend pushrods and brake adjusters etc Quote Link to comment Share on other sites More sharing options...
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