| [ Total Views: 819 | Total Replies: 8 | Thread Id: 2376 ] |
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 Woozy
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| posted on December 15th, 2002 at 01:17 AM |
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Tappet gaps !
While reassembling my rebuilt engine (we are doing it ourselves this time) i have noticed an interesting event with the tappets.
I have adjusted all the tappet gaps to .008 as per normal adjusting the gaps for cly 1 then moving to #2 ETC.
Everythign seems fine except that when the cylinder is not the one firing the gaps on tappets increase to more than 3mm
This engine is fully rebuilt with a semi race cam ?
is this normal ?
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vwrallycar
A.k.a.: Andrew Rankin
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| posted on December 15th, 2002 at 02:23 PM |
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i dont recomend 8 thou but try 6 or even 4 thou cold.
having just built my engine with a biggish cam i must say i have had no dramas there. just check it all again.
what pushrods are you using?
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Woozy
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| posted on December 15th, 2002 at 02:29 PM |
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Its standard pushrods.
I always use 008 or 006 (on a worn in engine).
As the bits get hot they all expand and if you lose the gap you start burning valves (not good that  ):bounce:bounce
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 Bizarre
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| posted on December 15th, 2002 at 08:24 PM |
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You SURE you aint 180 degrees out or something.
When you are firing then they are closed. Period. This is when they are set to 6 thou. I agree 8 is fine for a fresh motor.
SOmething is seriously wrong if you are getting 3 mm - that is 120 thou! (i think )
Either you dizzy is out or your push rods arent seating properly in the cups - OR SOMETHING!
Please triple check and tell us what you found.
Futue te ipsum!!!
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Menangler
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| posted on December 16th, 2002 at 06:54 PM |
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I think you will find you are 180 out, you are doing #1 when you should be doing #3.
I think 008 is to big, too noisy, I set stock push rod engines to 006, or 004 and check them offen.
I set my chrome moly push rod engine to 000, no gap, just so I can turn the push rod
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OvalGlen
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| posted on December 16th, 2002 at 08:47 PM |
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I once had a cam with similar valve clearance inconsistancies.
Some regrinds have a poor curve on the base circle of the cam. It is possible for variations in the valve clearance as your follower moves around the
base circle of the cam lobe.
But do check you have No.1 firing correct as noted prev..
I am also not keen to set the Valve clearance more than the 6 thou required. The valve clearance is to allow for expasion when hot. Funny isnt it how
crome molly has different expansion characteristics to that of standard alloy ones. That is why they can be set differently.
As Wes mentioned some time ago, to acertain the valve clearance for chrome molly rods - get engine to Hot operating temp and open rocker cover , set
tappet clearance "Ouch".
and then check when all is cold.Very little clearance is required.
Regards,Glenn>
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Woozy
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| posted on December 18th, 2002 at 08:19 PM |
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Figured out i am prolly 180 degrees out...
thanks guys
:bounce
tho i would still rather have noisy tappets than burnt valve seats ..
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Bizarre
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| posted on December 18th, 2002 at 08:26 PM |
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Just being an old "mother"
Do the old pencil trick.
take #1 plug out.
Turn the crank so as the pencil is fully pushed out and both valves are closed
What osition is the rotor pointing to?
Futue te ipsum!!!
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Bizarre
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| posted on December 19th, 2002 at 01:05 PM |
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Woozy
just reading on STF where a bloke is having trouble tuning his new motor and cam alignment was mentioned.
You "DID" line up the dots didn't you? :o
Futue te ipsum!!!
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Woozy
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| posted on December 19th, 2002 at 01:50 PM |
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dots are in the right place .... i was thinking last night that somehow
i may actually have been 360' out as i tried the pencil thing and the cylinder was at top position
anyway i think its sorted now
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Bizarre
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| posted on December 19th, 2002 at 02:19 PM |
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| Quote: | Originally
posted by Woozy
anyway i think its sorted now
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and........ or aint i allowed to ask?
Glad its fixed :thumb
Futue te ipsum!!!
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Woozy
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| posted on December 19th, 2002 at 03:10 PM |
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motor is still not in car 
staying away from home atm
prolly early jan before she is all running again
then i go back to scaring street cars
:rudolf:beer:party:party:beer:beer:beer
:beer:beer:beer
:puke:puke:puke:puke
:bounce:bounce:bounce
Everyone needs something to belive in !
I belive i shall have a beer !
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fatboy
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| posted on December 19th, 2002 at 03:41 PM |
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OK I've got my shiny new tools, a set of overalls, a copy of How to keep your VW allive and a first aid kit.
Reckon I'm ready to have a go at mine.:bounce
(I'll be back in about 3 hours when its all F***ed up)
" Captain Picard, why are there no Indians on the Enterprise ? Don't you need IT Support ? "
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