Landowner Posted February 22, 2014 Share Posted February 22, 2014 Long story but in a nutshell..... Fitted new big end shells, engine tight but ran ok After standing a long time, came to sort it and the engine wouldn't even turn with a socket and long bar on the crank, wouldn't move at all, not even a little bit. Took engine out and slackened big end nuts off a bit and it turned fine, removed shells and they are badly marked but not scored. They were originally torqued to 44 lbs ft (not nm) which I thought was a little tight but that's what the book said Shells marked as std but going to get new ones and try again What can be up with it as original shell were ok and crank seems fine Ta Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 If it was tight when you built it, that was a hint that something wasnt right. Are you 100% sure you got the correct bearings? Quote Link to comment Share on other sites More sharing options...
western Posted February 22, 2014 Share Posted February 22, 2014 what are the original shells marked as ? torque setting for conrod to cap is 59Nm so the workshop manual says. Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Bearings marked as STD Think 59nm is 44lbs ft Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 Regardless. If it turned ok after you loosened the big ends, then thats your problem. If the big end bearings were correct size they should not be marked at all. Im no expert on this engine but some engines have big end caps that sided. Ie it matters which way round they are? Quote Link to comment Share on other sites More sharing options...
western Posted February 22, 2014 Share Posted February 22, 2014 Bearings marked as STD Think 59nm is 44lbs ft close enough 59 newton meter = 43.51 pound foot Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Got std stamped on the back Quote Link to comment Share on other sites More sharing options...
redneck Posted February 22, 2014 Share Posted February 22, 2014 Can you post some pictures of the bearings, might help with diagnosis. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted February 22, 2014 Share Posted February 22, 2014 Maybe they are actually for a different engine....... Quote Link to comment Share on other sites More sharing options...
Tanuki Posted February 22, 2014 Share Posted February 22, 2014 I really think you need to pull all the bearing-shells: they're either the wrong ones for the crank-grind size, or you have some sort of crud trapped between them and the block/retaining-saddles that's pushing one or more of the shells harder on to the crank than is correct. A rebuilt short-block [fitted with crank/pistons/conrods, no oil-pump or camshaft-drive, all parts washed down with Acetone to remove any machining oil] should spin freely by hand: a good 'flick' on the flywheel should get you 4 or 5 revolutions before it stops Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 I really think you need to pull all the bearing-shells: they're either the wrong ones for the crank-grind size, or you have some sort of crud trapped between them and the block/retaining-saddles that's pushing one or more of the shells harder on to the crank than is correct. I reckon thats spot-on.. Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Wish I could photo bearings, camera is lost, not seen it for three weeks might have to buy another.. They are the correct bearings, my workshop is on the same premises as Lymm Engine Components Ltd so I have access to their stock and expertise, I can be sure that they are correct. I am thinking that they may have been over torqued, easy to set the wrench to just a little over 44 and then go a little beyond the 'click' and the total of both those 'mistakes' could add up to maybe 46/48 lbs ft Does any one know which way up the number on the end cap should be when fitted in relation to the engine, for instance....engine lay on side with turbo underneath, number right way up or wrong way up? Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 All shells pulled and clean as a whistle, all washed in paraffin when assembled and lightly oiled, I used to build Mini engines years ago and some of those would be a little tight but not as tight as this one, they would turn by hand but stiffish. Quote Link to comment Share on other sites More sharing options...
redneck Posted February 22, 2014 Share Posted February 22, 2014 A couple of foot pounds wouldn't make any difference to the bearings, putting the caps on the wrong way round will though, rods and caps are machined as a unit. Are the beaings showing more damage in the join area or the top and bottom? Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 I'll check the caps on Monday, I didn't actually fit them , I had help from a 'Mechanic' friend as I was unwell at the time and couldn't lift anything. I'll check that all numbers (1 2 3 4 ) are the same way up when we fit the new shells and if tight I will reverse them all. Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Bearings marked only at the join area on one side, not checked all of them though Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 I didn't actually fit them , I had help from a 'Mechanic' friend....... Ahhhh, I see. Yep. Caps on wrong way is where my money is.... Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted February 22, 2014 Share Posted February 22, 2014 As there are no oil jets on the con rods it does not matter which way round the rods are fitted, but the numbers stamped on the rods and caps should both be on the same side. Quote Link to comment Share on other sites More sharing options...
redneck Posted February 22, 2014 Share Posted February 22, 2014 Bearings marked only at the join area on one side, not checked all of them though As already said, that suggests the caps on wrong way Quote Link to comment Share on other sites More sharing options...
redneck Posted February 22, 2014 Share Posted February 22, 2014 Your going to need to polish the crank journals though. Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Ok, (cant quote for some reason) polish journals Looks like caps have been on wrong, I have been informed that both anti rotational cut outs should be together on the cam side so thinking they will be wrong Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 Bingo! Quote Link to comment Share on other sites More sharing options...
Landowner Posted February 22, 2014 Author Share Posted February 22, 2014 Need4speed, you were correct but didn't say which way round they should be (cant put smileys in either) : ) Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 22, 2014 Share Posted February 22, 2014 Ahhhh, I see. Yep. Caps on wrong way is where my money is.... My thoughts too... Quote Link to comment Share on other sites More sharing options...
need4speed Posted February 22, 2014 Share Posted February 22, 2014 Need4speed, you were correct but didn't say which way round they should be... Like i said. Im not overly familiar with this engine. Thats why i couldnt say which way. But your symptoms supported incorrectly fitted caps Quote Link to comment Share on other sites More sharing options...
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