head gasket related



head gasket related

Postby grumpyvette » July 2nd, 2009, 6:19 pm

Image
head gaskets fail for a number of reasons,
improper installation procedures,
corrosion, due to old coolant
over heating, due to low coolant,
a bad water pump or restricted t-stat or radiator
detonation, due to bad gas or improper ignition timing,
improper tuning of the fuel/air ratio etc.

in most cases if caught early, simply cleaning of the head and block and replacing the head gasket with the proper procedure after locating and correcting the cause of the head gasket failure will be all that's required,
if how ever you constantly try to run an engine with a defective head gasket you'll damage the block or heads in a short time, thru several reasons.
some common indicators of a blown head gasket, are white smoke from the exhaust (usually with a sweet smell)
loss of coolant with no obvious leaks, over heating of the engine, the engine runs rough and a inspection of the spark plugs and a compression test will usually show the defective cylinders, due to the condition of the spark plugs or the lower cylinder pressure readings, when you do a compression test on all cylinders

ideally a head gaskets bore will match or be slightly larger than the cylinder, a smaller bore gasket tends to over lap the combustion chamber edge and cause a hot spot that tends to aggravate detonation problems.
your SHOP MANUAL will give you both the correct gasket and the procedure and torque readings and tightening sequence of the head bolts.
obviously the condition of the block and head surfaces to be sealed and the clamping sequence and torque values use on the head bolts and any sealant used will vary but must match the application,(SHOP MANUALS, and HEAD GASKET MANUFACTURERS INSTRUCTIONS ARE A BIG HELP)

http://www.goodvibesracing.com/SBC_Head_Gaskets.htm
Image
when installing almost any head gasket, but especially with a copper head gasket be sure to put on two wet even coats on both sides of the head gasket and install and torque while the copper coat sprays still damp ,the spray fills in micro flaws in the machined surface
Image
Keep in mind there are solid copper head gaskets , Ive used for decades that you simply spray with copper coat and install damp and torque in place, and the TITAN style with a steel fire ring, sandwiched between to layers of copper, Ive never used the titan style but have used the solid copper gaskets extensively with good results, in both cases the head gasket must be slightly recessed between the head and block ,not sticking out into the edge of the combustion chamber
READ THE INFO IN THE LINKS THERES A GREAT DEAL TO BE LEARNED

viewtopic.php?f=50&t=1222

viewtopic.php?f=50&t=827&p=4572&hilit=copper#p4572

http://www.enginebuildermag.com/Article ... skets.aspx

http://www.aa1car.com/library/2005/ic010532.htm

http://www.import-car.com/Article/61817 ... _fail.aspx

http://www.aa1car.com/library/gasket_failure.htm

http://www.aa1car.com/library/ic697.htm

http://www.cswnet.com/~carother/compression_ratio.htm

http://www.misterfixit.com/deton.htm

http://racingarticles.com/article_racing-10.html

http://www.asashop.org/autoinc/jan97/gasket.htm

http://www.ehow.com/how_2316551_repair- ... asket.html


if you don,t have a particular engines torque sequence its a safe bet that you start with the center head bolts and tighten each , in stages in a spiral outward pattern, then repeat the sequence with each increased torque setting movng in that same spiral increasing diam spiral moving from the center to outer bolt locations.
Image
Image
the slight miss alignment on the coolant ports has no effect

Image
SBC HEADS
Image
Big Chevy
Image
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida

Re: head gasket related

Postby grumpyvette » September 13th, 2009, 10:12 am

heres a picture of a guys failed head gasket, he bought the engine off EBAY ,supposedly in good running condition,BOTH sides of the engine had failed head gaskets when he tore it down for inspection,ITS a fairly good bet that they both DIDN,T FAIL at the same instant
if he didn,t let the engine sit around for a week before pulling the heads , to inspect the problems source when he noticed the problem, the extent of rust in the combustion chamber indicates that was an EXISTING ISSUE and the resulting over heating probably cause the other side problem, btw those black textured head gaskets frequently fail in my experience.
I generally spend a good deal of time verifying the heads and block deck are flat & square & degreased and use spray copper coat on head gaskets(both sides and install them damp even if it says install dry, and I can,t recall EVER having a blown head gasket in the last 15 years

these don,t usually fail if installed correctly

http://www.scegaskets.com/Chevrolet/c259796/

viewtopic.php?f=50&t=6931&p=22695#p22695

viewtopic.php?f=32&t=10376

Image

if your finding a slime in the coolant passages of your aluminum intake on your engine, its likely the result of electrolysis

the cure requires three different changes, made to the coolant system,
the first is running a 50%/50% distilled water antifreeze mix with the newer antifreeze formulas
many guys clean the coolant passages in the manifolds and paint them with several coats of marine hull paint before installing them on a car also

the second is INSTALLING A COUPLE ANODES in the engine

the third is making sure the engines well grounded in two places to the BLOCK, not the intake, and to the cars frame and battery

http://www.flex-a-lite.com/auto/html/anode.html

http://www.bmcno.org/RadCap.htm
Image
Image

Image

viewtopic.php?f=57&t=74&p=4123&hilit=anode#p4123
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida

Re: head gasket related

Postby grumpyvette » October 28th, 2011, 5:58 pm

HEY GRUMPYVETTE???

1. Do we need to keep the dowels on the block as we have studs now?

YES, they maintain correct alignment between head and cylinder centerline

2. Should we use a thread sealer of some sort when installing the studs?

YES on the lower course block threads on the studs
Image

3. Should we torque the studs or will the torque from the heads be enough?

NEVER TORQUE STUDS INTO THE BLOCK, they go in finger tight AFTER using a tap to clean the thread holes, and coating the threads with sealant

4. Do we need to install the studs after we put the heads on the block, using the aforementioned dowels?

you can, or you can slip the heads down over the studs

This is my first time using studs and first set of aluminum heads also. So are there any secrets that I should know?
Thanks guys,
viewtopic.php?f=51&t=10464&p=43788#p43788

USE THE CORRECT SEALANT on the lower course threads, clean out the block threaded holes with a tap, solvent and high pressure air

TORQUE THE HEAD IN STAGES, dip the studs in sealant and thread them in till the bottom out then back them out 1/2 turn

USE A HARDENED WASHER UNDER THE NUTS, before you coat the upper thread the nut goes on with lubricant, then torque in the correct patter in at least three stages, then go back loosen the studs and re-torque each twice more , this sets the stud stretch by cycling the stub stress up and down the recomemnded three cycles

Image
this should be used only in head bolt holes that don,t enter water jackets in the block

Image

READ THE LINKS

viewtopic.php?f=50&t=50&hilit=studs+sealant

viewtopic.php?f=44&t=700&p=1095&hilit=studs+sealant#p1095

viewtopic.php?f=50&t=328&p=403&hilit=studs+sealant#p403

viewtopic.php?f=50&t=1222

viewtopic.php?f=44&t=15&p=21&hilit=studs+sealant#p21

viewtopic.php?f=32&t=10376&p=42831#p42831

viewtopic.php?f=52&t=4403&p=12554&hilit=head+gaskets#p12554
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida

Re: head gasket related

Postby TexasT » May 28th, 2014, 7:12 pm

Image

I broke a headgasket. I think your above mentioned timing, dual quality and a healthy dose of BOOST led to its not holding pressure any more.

The mating surfaces need to be very clean.
I put studs in the side I did.
I like this stuff for sealing fasteners that go into the water jacket.

Image

I am never up for don't fix it if it ain't broke so I didn't pull the other side. Seems not to be a problem as the new one seems to be sealing well. Engine back to generating pah and punishing tires.
Rich
TexasT

User avatar
 
Posts: 20
Joined: May 27th, 2014, 3:18 pm
Location: Texas


Return to Tools, Procedures, and Testing trouble shooting

Who is online

Users browsing this forum: No registered users and 3 guests