Porsche 944 Timing Belt Failure & subsequent results. Got a 944 Porsche 2.5lLiter 4 Cylinder. Unfortunately it has an interference head. Some mechanics tried to "fix" it not knowing what "interference" means. They replaced the timing belt and bent the valves even more. They gave up the 2nd time around. Good thing they never finished the job as it would not have worked anyway.
Cylinder Head 105 - Valve Job Basics
Valves not sealing? Valves not bent? This is how you fix that problem.
In this video I outline the basic valve job procedure. Cleaning the
valves, cleaning the seats, cleaning the combustion chamber and lapping the
valves in to make a better seal.
Here I cover the process start-to-finish. It's the same exact process for
pretty much all non-rotary combustion engines. It takes patience and
perseverance to do this job, but anyone can do it. Reference your service
manual for measurements and service limits. Everything else that's not in
your service manual is in this video.
I apologize for not having broken busted crap to work with in this video.
It's more beneficial to all of you when bad fortune falls on me because it
gets well documented, and many people watching these videos are looking for
answers. If you have bent valves, you will discover it quickly once you
chuck one up in the drill. You'll see the face of the valve wobble around
while it spins. You'll see evidence of this damage on the valve seat. If
it's bad, you may see damage on the valve guides in the form of cracks or
missing pieces where the valve guides protrude through the head ports.
Give all that stuff a good visual inspection. ...and if you doubt yourself,
never hesitate to get a second opinion or consult a machine shop. They
will have access to expensive tools that you wont find in your average
Porsche 944 S2 How to replace water pump, timing belts and shaft seals
нажмите CC и выберите русские субтитры
for English titles press CC
The video gives a tutorial how to replace the water pump, all belts and the
shaft seals on a Porsche 944 S2.
Das Video gibt eine Anleitung zum Wechsel der Wasserpumpe, aller Riemen und
der Simmerringe bei einem Porsche 944S2
Видео представляет наглядное пособи о
том как заменить водяной насос, все ремни
и прокладки уплотнения валов на Porsche 944 S2.
Porsche 944 engine assembly - cylinder head
Assembly of the cylinder head for a Porsche 944. This is where I install
the valves, put the head on the short block, and put on the camshaft. If
you have a 928, just do this twice!
Timing Belt - the Forgotten Belt (by Dayco)
Timing Belt - the Forgotten Belt. This video stresses the importance of
checking and following the manufacturers recommended replacement interval
for the timing belt. Along with recommendations to replace the "hardware"
associated with the Timing Belt (Tensioner, Water Pump, and Idler Pulleys)
at the same time the Timing Belt is being replaced. To find out more
information on our Timing Belt, Timing Belt Kit, Water Pump Kit, and Timing
Component Kit, visit www.daycoproducts.com
Porsche 944 12 sec run
My porsche on MC39 Dragrace where I manged to clock 12.089 on 1/4 mile with
201kmh trap speed.
This is what it means when a timing belt breaks.The valves bend after they
hit the pistons.This is a test i use to determine
quickly if severe damage has occured.A shop may use vacuum or simply
rebuild the head as bent valves become obvious when refaceing them.Valves
of a small stem diameter may not leak as the valve spring pressure
pulls the valve straight enough to seal.
But after repeated cycles of opening the head of the valve will break of
destroying the engine.
Also the valve guides are usually cracked in KIA HYUNDAI heads and the
smalls pieces will go in the engine.I have seen guides cracked in all the
16 valve heads
1994 Honda Accord w/ Bent Valve
A video illustrating how your 94 Accord's engine will probably sound if it
has a bent valve. Bent valves often happen in cars containing intereference
engines, such as this particular model of Honda. They occur most often when
the timing belt breaks during operation of the engine. This is an expensive
repair, requiring the engine head to be dismanted. To avert this disaster,
change your timing belt every 90k miles or sooner. This particular car had
about 178k miles on it at the time of the video. There was a bent valve in
cylinder 2, and the cylinder lost all compression.
Testing for Leaking/Bent Valves
--Please Read-- :)
Some of the best advice I can offer you about fixing your car is to search
for an online forum related to your car, or even for your specific engine.
If you have a popular car or engine, this can be an amazing tool in
diagnosing and fixing cars yourself!
1. Get kerosene, gasoline, or break cleaner.
2. Tilt head on its side, with the ports of the valves you're testing
pointing up and exposed.
3. Fill the intake or Exhaust ports
with the liquid you chose, make sure to use enough liquid to cover the back
of the valve head completely inside the port.
4. Look at the valve surface in the combustion chamber for leakage. (Let it
sit for several minutes)
5. If there is a leak, you could have a bent valve or just a bad seal of
the valve to the head. You might have to replace the valve, or just use
some lapping compound to lap the valve/seat to resurface.
6. Repeat for the other side if you wish.
7. This is a great time to replace valve seals if you have noticed they are
worn too much.
8. If you have any questions, please post them here and I'll try to answer
You just tilt the head on one side or the other depending whether you want
to test the intake or Exhaust valves.
I'm testing the intake valves in this video. I did this way because I
didn't have the leakdown test equipment, but also because I wanted to
replace my head gasket anyway. I wouldn't say this is the best way to test
initially if you suspect leaking or bent valves because it requires you
remove the head. Try just a regular leakdown test first. But if you're
taking it off anyway it's pretty nifty and doesn't require the leakdown
test tools. There are several methods to do this, this is just the one I
chose in my situation.