namless
Club Retro Rides Member
Posts: 580
Club RR Member Number: 26
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Jan 22, 2010 21:07:40 GMT
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Hi guys,I need some help with a diesel engine, its from a Volvo 940. So its the 2.4TD Audi/VW lt van engine. I am working on the head and have taken it apart, done the valve guides, laped the valves, put the new oil seals on the valve guides and have put all the valves back together. The problem how do I adjust the tappets on them? I mean all apart from one valve are sealing. I can't find any information on the valve clearance,  it all says its hydraulic :S here have a picture for your trouble ;D  thanks gobs |
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Jan 22, 2010 21:26:30 GMT
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are the valves not seating then?? as in your not getting any compression up??
its spinning over really fast on the starter??
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robg2
Part of things
Posts: 815
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Jan 22, 2010 21:33:45 GMT
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need to know the above...
But either:
one valve isn't lapped properly
one valve is bent and not closing properly (you'll never lap it)
one lifter is stuck
there's a wrong component somewhere - valve too long etc
have you had the valve seats cut?
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Jan 22, 2010 21:34:53 GMT
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don't know about volvo/vw hydraulic tappets but in the old days of doing vauxhalls and stuff if you released the pressure on them they would open up and get bigger.. thus holding the valves OPEN.. with the vauxhaull ones you could unseat the valve in them with a pointed tool and close them back up, then run engine and they would refill and re-adjust themselves..
do some googling.. somewhere will have the details on how to reset the hydraulic tappets correctly... (how to drain them down)
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Jan 22, 2010 21:38:32 GMT
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did you squeze the oil out of the lifters before putting it back together. if not there jacked up causing the valves not to seat if it was my car i would put a rope on and tow it down the road it will start once the oils been squezed out abit. and towing it wont cause any damage your valves arnt open enough [ I'm sure they'll be a smart coment along shortly]  |
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97 volvo 940 turbo wagon
87 fiat strada abarth
78 gs1000
82 katana 1100
84 gsx1100 efe
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Jan 22, 2010 22:12:31 GMT
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did you squeze the oil out of the lifters before putting it back together. if not there jacked up causing the valves not to seat if it was my car I would put a rope on and tow it down the road it will start once the oils been squezed out abit. and towing it wont cause any damage your valves arnt open enough [ I'm sure they'll be a smart coment along shortly] yeap.. he's right! ;D did just that to a rover K series last week after a head rebuild(another one!) valves wouldn't seat. even tried the plugs out,spin it over. and the oil down the bore to up the compression trick to try and get them to seat.. but they wouldn't so out came the tow rope... she fire up after a little run down the road ;D but must say you need to try all off the above before you try the last resort!! better to be safe than sorry  |
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namless
Club Retro Rides Member
Posts: 580
Club RR Member Number: 26
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thanks guys, ;D i have not bolted the engine back together I just bolted the cam and spun it by hand just to check all's well but, then i realised this one valve  all valves are lapped properly. all valves seal when there is no cam/tappets. no bent valves. all the valves closed/sealed apart from X. I then unbolted the cam off and swap the tappet bucket of X that was not sealing, with the one of valve Y that I knew is/was sealed. which seems to d the trick, however now all valves apart from Y are sealing :S I did not empty any of the lifters (don't know how to) but tried pushing it down as I can push down a few of the others, but it seems to be jammed. if any one knows this will be grateful, but i will also goggle around to see if anything comes up. thanks for your time  Gobs |
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it all says its hydraulic :S
