Whats the timing supposed to be?

[Bobbo63]

Im getting around 11 deg before tdc. My cams line up with eachother. Still havent checked at the crank. My compression difference is right around 30 psi between the left and right bank. 150 on each cyl on the pass side, and 120 on the drivers side. Im thinking since the cams line up, and they are matched at tdc, the crank may have slipped. Any ideas?

[johnegg]

cam timing marks:

the hash marks on the front outer edge of the cam sprocket should be straight up in the 12 oclock position.

 

crank timing marks:

the hash mark on one of the rear ''tabs'' of the crank sprocket shouldv be straight up in the 12 oclock position.

(when the crank is correct, the key way slot in the crank pulley should be straight down in the 6 oclock position.)

 

using the crank key way as a guide means you do not have to remove the pulley or the timing cover to check the crank timing.

just the crank bolt needs to be removed to check the crank timing.

 

BTW,

i really expected the cams to be off.

 

you can, could , use a timing light to check timing,

but no one does.

referring to TDC isn't really relevant .

subaru has given relly easy reference points fro belt installation.

 

check the crank timing.

[Bobbo63]

how hard would it be to get it to slip? dropping the clutch into 1st gear @ 60 mph?

[johnegg]

how hard would it be to get it to slip? dropping the clutch into 1st gear @ 60 mph?

this is a relative question.

when all the timing components are new and in good working order,

it is really hard to make it jump a tooth.

DUH! only a crappy car would let the belt jump when new.

but the older the parts get, the possibility increases.

 

and if any one part ages more quickly,

or is older,

or is failing,

then the chances increase .

 

easy questions:

how many miles on the car?

how long have you had it, years, miles?

have you done the timing belt?

 

harder questions:

how old is your timing belt?

when the belt was last done, what parts were replaced?

belt?

smooth idles?

toothed idler?

tensioner idler?

water pump?

 

all these parts age and will fail at some point.

it is possible to ''do the timing belt''

and do nothing else but the t-belt.

but at some point you will need to address the rest of the parts.

or if not you,

the next owner will.

 

 

also popular to do with the timing blt,

cam seals? w/ o-rings?

crank seal?

oil pump resealed?

 

questions?

[RustyRuu]

have you ever been bumped from behind in traffic or bumped anything in reverse backing out?

 

moved/pushed your car in gear by accident or on purpose, it used to happen at my old job people pushing cars across the parking lot and such when nobody was in them or around.

 

this can cause tooth jumping

[Bobbo63]

my car has 260,000, ive had it about a year. Its always done this. The car has decent damage to the back from before i owned it.

[RustyRuu]

this could cause a tooth jump but there is something called a bump plate that is suppose to prevent it but if not measured or tighted properly could easily fail. mine jumped a tooth from being bumped in the rear and my bump plate did nothing, or maybe it juat kept it from jumping multiple teeth.

 

only way to tell is to look. take the harmonic balancer off and see if what johnegg was saying is true with the keyway slot being at 6 o clock for a quick check. i would just do the whole timing cover and see for myself what the teeth and marks are at exactly.