timming belt issue ??


abunai888

abunai888

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i was doing a valve lash check since i never did on this motor and when i turned the crank at tdc i found this
2012-05-20171606.jpg

2012-05-20171531.jpg

tried to fix this but always i get the same result !!

btw motor is a stock internals jdm b18c
and timming belt is gates powergrip almost new it has 12.000 km on
what can that be ??
 
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Totally fine..

When you rotate the crank slowly the belt can get slack between the 2 cam gears because the cams have different spring pressure against them.

This isnt an issue when the car is running , but always a good idea to check the belt tension
 
thought all 3 marks should be aligned ...
belt tension seems ok .:nice:
after i rotate the engine couterclockwise a full 2 turns its off by half a tooth on the cams like on the pics
if i align the cam marks then the pulley gets off by this

2012-05-25185357.jpg


i was trying to fix this all morning :)
i used 5mm punches on the cams to keep them steady etc...
i was running like this God knows .
 
yup oil pump mark its off too...
removed the plastic cap
when cams are aligned the oil pump gear is off like the pulley mark !
 
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Yeah then Id say its ok . Ive had some not fully line up on the cam gears for whatever reason even though its on TDC. Once the cams are locked and the oil pump mark is ok your fine. Running a tooth off is very obvious.
 
strange tho.

a friend drop me his old cam gears to try
nothing changed ..:((

mine it's not even a hole tooth almost a half.
it looks like the exhaust cam opens faster than the intake one isnt that bad for performance ?
 
Mine was the same when I done my timing belt.
Just slightly out by half a tooth.

That was months ago and mine is fine.

Duffy
 
abunai888 said:
strange tho.

a friend drop me his old cam gears to try
nothing changed ..:((

mine it's not even a hole tooth almost a half.
it looks like the exhaust cam opens faster than the intake one isnt that bad for performance ?
Click to expand...


If your worried about the cam timing get them dialled.
 
Is it possible the rubber damper in the pulley has worn slightly causing outside to have rotated a bit. Just a random thought.
As said tho, to be 100%, get them dialled correctly.
 
ga's ek9 said:
Is it possible the rubber damper in the pulley has worn slightly causing outside to have rotated a bit. Just a random thought.
As said tho, to be 100%, get them dialled correctly.
Click to expand...

also checked the mark on the gear crank & oil pump and it's the same.
its off by half a tooth ...
 
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