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puff of smoke on start-up clevo 302 

 

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 Post subject: puff of smoke on start-up clevo 302
Posted: Thu Apr 12, 2007 12:10 pm 
Oompa Loompa
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having a lil problem, whne i fire up my clevo it puffs a bit of smoke and it floats down the street, haha a lil embarrasing sometimes but i dunno what i can do to stop it, whether there is some additive i can put in my fuel, i dunno

a couple of people told me its my valve stem cells or something something, not sure cant really rememeber

does anyone else have this problem or does anyone know how to stop it/fix it?
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Posted: Thu Apr 12, 2007 12:15 pm 
Getting Side Ways
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Definately sounds like valve stem seals.

They cost next to nothing, you should replace the rocker gaskets while you're at it.

Now the hard part, they take a bit of doing but you need the right tools to do it, you'll need a valve spring compressor and also an air compressor to fill each cylinder with air to hold the valves up.

I done a Clevo in the car in under an hour start to finish, but i've done quite a few.

If you were in Melb i'd help you out with tools etc, you can make a spring compressor out of an old rocker arm, i'll take a pic as i have one in the garage.
The hard part is making or getting the fitting to screw into the head with a fitting for the air line.
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Posted: Thu Apr 12, 2007 2:04 pm 
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you can buy the right tools for under a 100 bucks at any good auto store

 

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Posted: Thu Apr 12, 2007 3:10 pm 
Oompa Loompa
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haha valve stem seals, lol i thort it was valve stem cells, haha i googled it and stem cell research came up and s**t, haha

thanks guys, ill go see my mechanics this arvo get prices, but ill wait till my mate gets bak from the states next month and me and him will prob do it then

thankyou guys :D
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Posted: Thu Apr 12, 2007 3:27 pm 
Oompa Loompa
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so, why and how does it spit smoke when i start, what causes it, oil leask into the cylinders or something? i dont really understand
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Posted: Thu Apr 12, 2007 5:51 pm 
Smokin em up
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The Valve stem seal, seals tightly with the valve stem and in the clevo, goes up and down with the valve (Umbrella type). Over time the seal hardens and cracks or wears and loses its seal on the valve stem. This allows oil to pass the seal, move down the valve guide and be burnt. There should always be a little oil getting past to lubricate the valve guide but not too much.

The reason you get a puff of smoke on startup is the oil has had time to accumulate either intop of the piston or valve, and is burnt all at once on startup. You may be able to notice an amount of smoke while running also.

I used felpro stem seals and im 90% sure the short ones go on the intake and the long ones go on the exhaust valves...it was a while ago though, double check that before you start. I just went to check on some old 302 heads but they were all the same size.

 

 

Attachments:
Cracked stem seal.JPG
Cracked stem seal.JPG [ 38.71 KiB | Viewed 44 times ]

 

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Posted: Fri Apr 13, 2007 1:34 am 
Getting Side Ways
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You may find most of yours are in the sump, seen plenty of that in Clevo and Crossflows.
The last time i had my Clevo heads worked on, my mate machined them to take Gemini stem seals, never had the problem again.
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Posted: Sun Apr 22, 2007 9:24 pm 
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If you have trouble getting an air fitting to work or even just finding one, I have used some thin rope & fed it into the cylinder through the plug hole. Wind the piston up & it'll hold the valves up fine. Make sure that you leave enough hanging out of the plug hole to get it back out when you are finished. Works a treat on valiant hemi 6's.

 

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Posted: Mon Apr 23, 2007 4:20 pm 
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walker, 16 valve stem seals from wo to go in under an hr!!! thats one valve (dissasemble to assemble) every 3.5 minutes.
do you have fairys in the bottom of your garden to?

 

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Posted: Tue Apr 24, 2007 1:44 am 
Getting Side Ways
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chrisredden wrote:
walker, 16 valve stem seals from wo to go in under an hr!!! thats one valve (dissasemble to assemble) every 3.5 minutes.
do you have fairys in the bottom of your garden to?

One thing with me, i don't spin s**t!

An air ratchet has all rocker arms off in a few minutes, a few minutes and all the plugs are out.

I've done quite a few Clevo's and 4.1's in the car so i know exactly which way to go about it.
It would probably take me longer now, i was young and keen back then, these days i just CBF.
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Posted: Tue Apr 24, 2007 3:14 am 
Getting Side Ways
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Hey Walker next time I'm heading to work can I call in and see those fairies please?
Are they any thing like what was posted on here a few months back? LOL
Anyway
My old man taught me the rope trick and also a modified screw driver trick,
When I was running Dato's they needed to be done once a year,
Due to them being s**t.
Whilst working at engineering company I ended up modifying the valve guides
and used Chev stem seals (copper over rubber bells with a retaining spring).
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