4k dieing.

[too_quick]

Ok so i took the ke70 for thrash and now it wont run on all 4 pots, 3 and 4 have died. Runs on all 4 over 3,500 RPM but under that its really lumpy.

Has spark and fuel so I'm suspecting rings blown out or maybe valve sticking open or something along those lines.

Any suggestions ?

[styler]

buy a compression tester from supercheap combo push on / screw in type
for about $30.

disconnect the spark system ie take out dizzy rotor or disconnect coil lead
and tape up to insulate. then take out all spark plugs. then push on tester
and let someone crank over motor for a few sec. take reading and
release gauge to do next one (push button on gauge)

do this on all 4 cylinders:

1.do a dry compression test (normal test as above)
2. then a wet compression test
(by putting a little bit of engine oil down the bores through the spark plug hole.)

if its low on dry test then it could be rings or valves
if its low on wet test then it valves
if its high on wet then its rings
if all or any single cylinders are under about 120psi its not good,
check your motor manual for specific specs on compression though.
if theres a variation of more than 20psi between cylinders its not good,
again check your motor manual for specific specs.

[too_quick]

buy a compression tester from supercheap combo push on / screw in type
for about $30 and see if the rings are cracked.

Will get the one from work tomorrow.

Could it have bent a push rod ? I don't have any tools at home so its had to check alot of stuff.

[styler]

toyota k series engine repair manual:

k series all Aus versions:
service specs:

compression pressure at 250 rpm : 156psi
limit : 128psi

difference of pressure between cylinders: 14psi

there ya go

[oldcorollas]

if you take off rocker cover, and rotate engine so the valves are closed (at TDC, 1235, then another 360deg to TDC = 4678) and spin the pushrods, you can easily tell if they are bent.

if they are stock pistons you may have smashed the rings or the pistons may have finally cracked.

chances are more like you have blown the intake gasket or the headgasket...

stick a torch around the intake gasket....

[JustenGT8]

I've got a 4K you have have for a case of beer Was running sweet and has a swag of new ignition bits etc......freight might be a bitch though?

[too_quick]

I've got a 4K you have have for a case of beer Was running sweet and has a swag of new ignition bits etc......freight might be a bitch though?

Yeah im an apprentice so i cant really afford the freight. There is a spare 4k at work but its been sitting for many years so i may be able to steal parts from it if need be, If its any good.

Oil isn't milky and the coolant is still nice and green, Hoping its not that though.

[oldcorollas]

check intake manifold.

the headgasket could be blown between cylinders.
turn the engine over by hand.. if it has points of resistance for 1 and 2, but nothing for 3 and 4.. you know it is somewhat farked... then take off rocker cover and see if all valves are closing properly.. see if you hear air leaking out to either the ports, head, or sump etc....

some basic investigation is required.

even looking down spark plug hole at top of piston is a start

[Grega]

intake manifold leak is an easy one
spray aerostart around the thing and see if the rev's go up...

[too_quick]

intake manifold leak is an easy one
spray aerostart around the thing and see if the rev's go up...

Doing that when im home before dark.

I don't have the inclination to touch the car at the moment, Got too much on my mind and no time to do anything.

[too_quick]

Finally got around to looking at it today.

Its the inlet manifold gasket, Leaking. I found the leak by spraying deodorant on the manifold and it ran like normal.

Des

[oldcorollas]

cool good idea!

and now it probably smells better too

is the gasket sucked in our blown out or?

i had issues with resonance blowing the gasket out on my 4K (not sucking it in)

[jfallen]

it's cool you got it fixxed, but it's a 4k, people give running examples away for free.

Cheers
Jordan

[oldcorollas]

and your point is?
it is better to swap in a different motor than to change the intake gasket?

[too_quick]

Haven't pulled it apart yet. I'm suspecting its just sucked it in. I cant hear any hissing or anything to lead to a leak but yeah it sucks in the deodorant and burning it.

This motor is staying, Doesn't blow any smoke apart from the odd bit of black fat while really giving it some but thats because i fucked around with the carby.