jojo Posted May 15, 2013 Share Posted May 15, 2013 hi just fitted an engine (unknown) into my mk 4 spitty was very smoky (white/blue) on start up and running just compression tested it no 1 cylinder has 0 compression, put a wee drop oil down and no difference stil 0 any ideas would be appreciated Quote Link to comment Share on other sites More sharing options...
tiggrr1 Posted May 15, 2013 Share Posted May 15, 2013 Sounds very much like a burnt out valve/valve seat to me. Quote Link to comment Share on other sites More sharing options...
nang Posted May 15, 2013 Share Posted May 15, 2013 Yeah. Sorry, off with its head. :'(Tony. Quote Link to comment Share on other sites More sharing options...
nang Posted May 15, 2013 Share Posted May 15, 2013 Yeah. Sorry, off with its head. Unless you have a tight tappet. :'(Tony. Quote Link to comment Share on other sites More sharing options...
jojo Posted May 15, 2013 Author Share Posted May 15, 2013 thanks guys the head is coming off then ! gutted so close yet so far... Quote Link to comment Share on other sites More sharing options...
jojo Posted May 15, 2013 Author Share Posted May 15, 2013 UPDATE removed suspect valve and valve guide appears to have "slipped" on inlet valve therefore it really tight for the valve to move, can the guides be removed ? if how? Quote Link to comment Share on other sites More sharing options...
tiggrr1 Posted May 15, 2013 Share Posted May 15, 2013 You'll need to take the head off and remove the offending valve, which may be bent causing the sticking (why?)The valve guides then come out in the direction of the combustion chamber by drifting or pressing them out, usually tap out with a hammer and suitable drift/punch/socket or whatever you have to hand to abuse it with ;)Refit is the reverse of removal but much more carefully Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 15, 2013 Share Posted May 15, 2013 Guides are simply a press fit. They can be bashed out (upwards) with a suitable drift but I'd recommend pressing them in and they often need reaming afterwards to ensure correct fit with the valve stem. Check the pushrod is not bent (by rolling on a flat surface) as if the valve was tight enough to move the guide, the pushrod may have suffered in the process.Guide is meant to be a much tighter fit in the head than the valve is in the guide - though a rusty valve can sometimes defeat this after a long period stood idle.....Nick Quote Link to comment Share on other sites More sharing options...
jojo Posted May 16, 2013 Author Share Posted May 16, 2013 Thanks Guys engine was dry when bought and de gasketed so has probably beensitting for a while Quote Link to comment Share on other sites More sharing options...
jojo Posted May 16, 2013 Author Share Posted May 16, 2013 can yo confirm does guide come out the top or down to the ports its presently half way down into the chamber Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 16, 2013 Share Posted May 16, 2013 Will go either way on the standard guides. Aftermarket ones occasionally have a step to prevent then doing what yours has done.Nick Quote Link to comment Share on other sites More sharing options...
jojo Posted May 24, 2013 Author Share Posted May 24, 2013 Update to above removed head and replaced with the one from original engine after a wee de coke all back together BUT STILL got plumes of blue smelly smoke coming out the exhaust engine seem to be running ok but the amount of smoke looks like th things on fire HELP and ADVICE please :( Quote Link to comment Share on other sites More sharing options...
Davemate Posted May 24, 2013 Share Posted May 24, 2013 It could be burning oil that has been deposited in the exhaust manifold/system from before Quote Link to comment Share on other sites More sharing options...
jojo Posted May 24, 2013 Author Share Posted May 24, 2013 Thanks could be but tbh it seems just as bad as before sadly, thought we had found the cause with the other head but doesnt seem to be the case Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 24, 2013 Share Posted May 24, 2013 I take it you don't have one of those external oil feed pipes fitted? Is the fuel reasonably recent and free from 2 stroke oil mix or diesel - they can cause smoke - especially a bit of diesel.......Otherwise possibly stuck rings. Try putting a couple of tablespoonfulls of ATF in each cylinder (Through plug-holes - easier to use a syringe!) while the engine is still warm then leaving overnight or even a few days. It will SMOKE when first started but may clear if the rings free off. Just keep it running until properly warm (20 minutes at least) and see if the smoke reduces.Good luckNick Quote Link to comment Share on other sites More sharing options...
jojo Posted May 24, 2013 Author Share Posted May 24, 2013 thanks Nick no external feed feul is recent, may ahve been dieslel in can not sure . Will try your tip though ;) Quote Link to comment Share on other sites More sharing options...
Davemate Posted May 24, 2013 Share Posted May 24, 2013 Blue smoke -oil burningWhite -water vapour If you have blue smoke then oil is being burt. Oil can only be burnt if it gets into the bore.It either comes up past the rings,goes down the inlet valve or is in the fuel This is presuming the head gasket is sound If you have had new guides fitted that should have elimatated oil running down the inlet valve. Quote Link to comment Share on other sites More sharing options...
jojo Posted May 26, 2013 Author Share Posted May 26, 2013 didint fit new guides put different head on but used same valves rockeer etc Quote Link to comment Share on other sites More sharing options...
Davemate Posted May 26, 2013 Share Posted May 26, 2013 Have you run the engine for any lenth of time to see if there is any oil residue in the exhaust or inlet track that is just burning off.I'm talking ten or fifteen minutes. Quote Link to comment Share on other sites More sharing options...
jojo Posted May 26, 2013 Author Share Posted May 26, 2013 not 10 min , no the street looks like its on fire it does get worse when you rev it it really looks like a 2 stroke , compression seem ok though arggg Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 26, 2013 Share Posted May 26, 2013 time to re think that you just may have some contaminated fuel clouding the issue diesel can burn white or blue , easy if some muppet has mixed the hoses over on the pump and youre on autopilot Pete Quote Link to comment Share on other sites More sharing options...
Davemate Posted May 26, 2013 Share Posted May 26, 2013 jojo wrote:not 10 min , no the street looks like its on fire it does get worse when you rev it it really looks like a 2 stroke , compression seem ok though argggGoing by that statement, I would drain all the fuel from the tank and carbs then put fresh clean fuel in. As Nick said you could have bad fuel. If things are no better after that you can always put the old fuel back in the tank.Have you redone a compression test ? Quote Link to comment Share on other sites More sharing options...
dinger Posted May 26, 2013 Share Posted May 26, 2013 Oil control rings ? Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted May 26, 2013 Share Posted May 26, 2013 Sheer amount of smokes suggests to me to look elsewhere. I once fitted a 13/60 engine that had been stored outdoors, but covered over for years. Fitting it wasn't the original plan but fate was playing with me.......Anyway, this thing had virtually nil compression on all cylinders and could only be started with plenty of oil in the bores and 24v to the starter. When it did start there was initially alot of smoke as the oil I'd put in burned off but very little after 30 seconds or so. It needed about half throttle to maintain a fast idle and the breather was puffing like mad so there was plenty of gas passing the rings! Once it warmed up the rings started to free off and I had to keep backing the throttle off to stop the revs rising. The plumes from the breather slowed dramatically. After about 30 minutes it would idle normally with a normal level of throttle opening. At no point after the initial oil burnt off did it smoke as described.I've also seen the remains of a Spit 1500 engine where one piston had the rings literally in bits with the land between them all broken up. That used to blow oil out of every orifice and chuff like crazy out of the breather - but it didn't smoke much from the exhaust.Dodgy fuel has got to be a strong possibility - unless the car has a brake servo fitted and it sucking the fluid out of that?Nick Quote Link to comment Share on other sites More sharing options...
marktheherald Posted May 27, 2013 Share Posted May 27, 2013 To save draining the tank, rig up a gravity feed, or pick up from another temporary tank. If it clears, then drain your tank. Quote Link to comment Share on other sites More sharing options...
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