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1 12th November 22:10
jpoy
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


Hi everyone!

This is my first attempt to I installed a new timing belt on my 1989 3.0L
Caravan LE.

I checked the crankshaft and camshaft marks by rotating the crankshaft 360
degrees the front camshaft mark did not match the outside mark. The front
camshaft must have moved while I was installing the belt. So I removed the
timing belt and turned the front cam nut (about 10-17 notches) with a
wrench, so the mark on the cam would match the outer mark. I reinstall the
timing belt again rotated the crankshaft 360 and the cam mark it was still
off. The marks on the Crankshaft and rear Camshaft match up ok.

How can I adjust the front camshaft so all the marks are aligned? If I
rotate the front Camshaft a full 36O will this align the marks?

Can you please help me I am really desperate? Thank You!

Jim

BTW. I found this forum very helpful and enjoy reading all the posts
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2 12th November 22:31
budd cochran
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Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


Camshafts turn at one half crankshaft speed . . . the mark moves to the side
opposite where it's starts doesn't it?

Turn the crank another 360 and see what happens!!!!

--
Budd Cochran
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3 12th November 23:12
junkmail01
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


There are four cycles in your engine(4 piston movements), intake(fresh
air and fuel in), compression, explosing, clearing(exhaust). One
complete revolution on the crank only covers two of these stages,
since you only had two piston movements, so you will need to rotate
twice on the crank for all four strokes. You'll probly notice where
the belt goes over the crankshaft is about halft the size of where the
belt goes over the cam shaft, so you can physically see that it will
take two crank revolutions for one cam revolution.

Hope this helps,

tom

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4 12th November 23:13
jpoy
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


Thanks Guys, for your remarks they are very helpful!

I have no problem seeing all the timing marks on the Crank & Cam shafts. But
my concern is that I have moved the front Cam (10 to 17 notches) clockwise
with the "timing belt off" in order to set the front Cam timing mark, will
this cause any problems with the timing on the front cam itself? Can you
turn the front cam ccw (10 to 17 notches) back to reposition its timing
mark? Or do I have to rotate it 360 cw to set the timing mark.

I guess my question should be. Can you relocate the camshafts (CW or CCW)
with the "timing belt off" in order reset the timing marks if the cams
moved?

My present settings with the belt installed are:

.... Crankshaft timing mark, ok
.... Rear Cam mark timing, ok
.... Front Cam mark (10 to 17) notches advanced CW from the timing mark.

With the timing belt off can I turn the front cam CCW (10 to 17 notches) to
align the timing marks? Or do I just turn the front cam 360 CW to set the
timing marks.

Wow I think I'm going crazy!

But to tell you truth its simply a lack of understanding how all the cams
and crankshaft work together :-(

Thanks Again!
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5 13th November 00:00
neil nelson
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


Yes, turn the front cam any which way you see fit to line up
the marks. The 3.0 is a non-interference motor, so there is
NO risk of any damage by moving the cams in any direction to
re-align them. Clockwise is always best because it
eliminates any risk of loosening a sprocket retaining bolt.

The cam sprockets are twice the diameter of the crank
sprocket, they (cams) turn half the speed of the crankshaft.
360* of crankshaft rotation = 180* camshaft rotation.
720* of crankshaft rotation = 360* camshaft rotation.

Set the crank sprocket, set the cam sprockets, install the
T-belt (keeping it taught between sprockets) starting at the
crank sprocket and working your way counter clockwise
towards the front cam, then the water pump, then the rear
cam, behind the tensioner, release the tensioner so it
tensions against the belt, lock the tensioner down, rotate
the crankshaft two full turns (720*) and recheck the timing
marks.
The small spring steel binder clips sold in office supply
stores can be used to hold the T-belt in place once it's
properly positioned on the cam sprockets, be sure to remove
them before you turn the engine and check your work...
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6 13th November 01:52
jpoy
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


THANKS!

I Neil I got it :-) with your help :-)

I re-aligned all the timing marks on the cam and rotated the crankshaft 720
and yes they were right on. I did notice that the tensioner slides up and
down but not always keeping the timing belt between the water pump and the
rear cam tight, but as I slowly rotate more it would tighten up. It seems as
I rotate the crankshaft it would go through different cycles it would be
harder then turn easier. Is this normal?
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7 13th November 01:52
neil nelson
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Posts: 1
Default Crankshaft & Camshaft Timing Marks, Re-align Camshaft Mark


Good to hear...

The tensioner should not move, it gets bolted down tight
once it has sprung back against the belt.
IOWs, the T-belt tensioner does NOT act like a spring loaded
tensioner would on a serpentine belt, the attached spring is
there to set the tension but then the whole shee-bang gets
tightened down in place.

On the harder-easier thing, sounds like you are rotating the
engine by hand and experiencing the normal resistance of
cylinders coming up on their compression stroke.
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