Re: Noisy engine, cracked exhaust? '90 Celica
- From: Bruce L. Bergman <blPYTHONbergman@xxxxxxxxxxxxxxxxx>
- Date: Fri, 01 Sep 2006 01:22:17 GMT
On Thu, 31 Aug 2006 10:11:40 -0500, "Ray O"
<rokigawaATtristarassociatesDOTcom> wrote:
Spray a liberal amount of rust penetrant on the bolts and tap with a hammer,
let it sit overnight. Do this several times before you attempt to remove
the bolts.
I can NOT emphasize enough what Ray says - Ignore at your own risk.
You can do this yourself - but you MUST know when to stop and get more
help. Or you will be forced to.
The exhaust manifold bolts/studs to the heads and the exhaust
collector downpipes are the number one rust magnets because they get
red hot on every run cycle.
When removing the nuts do NOT just start cranking on them like a
gorilla, or you WILL snap off a stud. Sometimes you have to rock them
loose - but first drench them in a good commercial penetrant like
Kroil.
Or mix a batch of "Ed's Red" penetrant, dirt cheap yet effective:
1 Part Dexron Automatic Transmission Fluid
1 Part Deodorized 1K Kerosene
1 Part Stoddard Solvent AKA 'White Spirits' or 'Aliphatic Mineral
Spirits Type I'. Get it at your favorite petroleum distributor.
(I'd leave out the 1 Part Acetone and 1 Part Lanolin for this use.)
CAUTION: Stoddard Solvent flash point ~100F, and 1K Kerosene not
much higher - No Smoking! No Open Flames! No Kidding.
Then you tighten a quarter turn, loosen a quarter turn, tighten,
loosen... Eventually they'll loosen one turn for each half turn
tighter, then they'll get out onto clean threads and zip the rest of
the way off.
If you sense there are one or two nuts that simply aren't going to
let go, before they break get a nut-cracker or a "Hot Wrench"
(Oxygen/Acetylene or Plasma cutting torch) in there (After the
penetrant evaporates...) and cut/split the nut off the stud. After
you get the manifold off and out of the way and have working room,
then you can either clean up the threads or replace the stud.
MUCH easier to get the old stud out when it isn't broken off flush
with the head. That is the ultimate bad news - then you get into
difficult tricks like welding a nut onto what's left of the stud
sticking out to act as a bolt head, or taking the head off the engine
to have the stud extracted in a machine shop or burned out with a Wire
EDM Machine.
And when you put it back together use anti-seize compound on the
threads - don't slop it on, just a little dab will do wonders. A thin
coating of nickel or copper based paste that will keep them from
rusting together quite so bad next time.
--<< Bruce >>--
.
- Prev by Date: Re: The Dam Ozone hole
- Next by Date: Re: The Dam Ozone hole
- Previous by thread: Re: {OT} The so called Ozone Hole OVER ANTARCTICA
- Next by thread: Re: Noisy engine, cracked exhaust? '90 Celica
- Index(es):
Relevant Pages
|
