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Model specific boards => Golf mk3 => Topic started by: palmer on 22 September 2010, 21:39

Title: smoke when starting up ?
Post by: palmer on 22 September 2010, 21:39

1.8 convertable 118 k miles  on the clock

some times on starting  in the morning there is a puff of smoke out the exhaust
not every time  also there is a " slight knock " that goes immediatly

I think it is

1) valve guides worn  allowing oil to pass  and butn off

2)  possible big end bearing that stops when oil gets  into  it


any one got any ideas ?

cheers

rob

Title: Re: smoke when starting up ?
Post by: Wayne on 22 September 2010, 23:36

1.8 convertable 118 k miles  on the clock

some times on starting  in the morning there is a puff of smoke out the exhaust
not every time  also there is a " slight knock " that goes immediatly

I think it is

1) valve guides worn  allowing oil to pass  and burn off - Yep or stem seals

2)  possible big end bearing that stops when oil gets  into  it - again yes or a tappet maybe.


any one got any ideas ?

Title: Re: smoke when starting up ?
Post by: palmer on 23 September 2010, 22:42

thanks

rob

Title: Re: smoke when starting up ?
Post by: palmer on 14 October 2010, 16:34

how big a job is it to take the head off and replace the valve sten guides ?

do I need a speacial tool  to remove / replace  the sten guides ?

cheers

rob

Title: Re: smoke when starting up ?
Post by: fozziie on 14 October 2010, 16:53

ive got a 1.8 GL thats a bit "smokey" when its cold, its fine once it has warmed up though...maybe its just cold?

Title: Re: smoke when starting up ?
Post by: Wayne on 14 October 2010, 21:56

Quote from: palmer on 14 October 2010, 16:34

how big a job is it to take the head off and replace the valve sten guides ?

do I need a speacial tool  to remove / replace  the sten guides ?

cheers

rob

Yes really, however it can be done without removing the head.

Title: Re: smoke when starting up ?
Post by: palmer on 15 October 2010, 21:25

thanks for that 

could you explain it a bit to me  and what " tool "  do I need ?

cheers

rob

Title: Re: smoke when starting up ?
Post by: Wayne on 15 October 2010, 23:30

It can be done with leaving the head on and using compressed air.

Title: Re: smoke when starting up ?
Post by: palmer on 20 October 2010, 13:55

do you take out a spark plug  and pump air in then work on the valve but just taking off the rocker cover ?

cheers

Rob

Title: Re: smoke when starting up ?
Post by: Khare on 20 October 2010, 14:22

Kind of... You screw an adaptor that keeps a high air pressure in the cylinder (with the help of an air compressor), meaning it holds the valve tight against the cylinder head. This allows you to compress the valve spring and get the 2 half moons out, allowing you to remove the valve springs to access the valve stem oil seals. It's a camshaft cover and camshaft off job, and obviously the tappets off too.

Title: Re: smoke when starting up ?
Post by: N2AE86 on 21 October 2010, 19:58

It would be more likley that its the valve stem seals rather than the guides themselves.  Mine does similar if left for a few days, got the seals just need to get enough time to swap them.

FYI you can also do it without using compressed air.  A long length of thick para cord, can be tucked down the spark plug hole (make sure you tie a fat knot in the end so you dont loose the whole thing down there) - then with the cam removed turn the engine over so you set the bore your working on to TDC - the piston will compress the cord against the bottom of the valves - holding them up.  Then you just need to compress the valve spring, remove the retainer and collets.  This tool from snap on makes life easier.

http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=78777&group_ID=1578&store=snapon-store&dir=catalog

To give you a better idea of how it works - its not a VW lump but you should get the gist.

http://www.aeu86.org/index/engine-diy-4age-valve-stem-seals_/cat/9/topic=4156/post=75407