What causes timing belt to slide back?

[e30Rooster]

What makes the timing belt slide back towards/rub on the head? The lower cover?

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[e30Rooster]

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[BROKINBIMMER]

Not sure, but mine slides the other direction.

[dougie30]

if it is sliding like that check those two little rubber plugs right behind the cam gear on your head (you can see them in the pic above) they may be leaking oil and causing your tb to slide back and forth.

[jlevie]

Worn bearings on the intermediate shaft or tensioner will cause the belt to to track to one side.

[e30Rooster]

Worn bearings on the intermediate shaft or tensioner will cause the belt to to track to one side.

Whats the intermediate shaft? Cam? Ill try replacing the tensioner its made by gates and only has 2 months and 10k miles on it.

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[e30Rooster]

Nvm found it. It connects the oil pump to the timing belt -_- one thing after another, ill have a new engine soon.

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[jlevie]

Replacing the intermediate shaft bearings is a non-trivial process that pretty much can only be done with the engine out of the car and torn down. That much displacement of belt isn't anything to worry about. It would only be necessary to deal with the problem if the belt moves far enough off center to rub on the head or timing cover.

As an FYI:


The bearing part numbers are:
11-11-1-280-863
11-11-1-264-196

Measure the IM shaft diameter, chuck the bearings up in a lathe, slow speed,
cut to initial size. Use a standard cam bearing installation tool and install
them in the block, they will crush and become smaller then the diameter of the
shaft. Hand finish with a brake cylinder hone, low speed and a little goes a
long ways. Test fit, finish sizing with green scotch brite. Oh ya, make sure
the front bearing lines up with the oil feed hole from the #1 main bearing
feed (The second bearing does not matter as it is fed through the shaft from
the front journal)

You want about .001-.0015" clearance, I would say .002" max Anything more then
that and you risk loosing too much oil pressure.

[mr.vang]

When I installed my timing belt the same thing happen to mine. If I recall correctly, it has something to do with tighting to tensioner. I think your suppose to rotate the motor with the tensioner still loose then tight it after rotating the motor 3-4 times.

[e30Rooster]

Replacing the intermediate shaft bearings is a non-trivial process that pretty much can only be done with the engine out of the car and torn down. That much displacement of belt isn't anything to worry about. It would only be necessary to deal with the problem if the belt moves far enough off center to rub on the head or timing cover.

As an FYI:


The bearing part numbers are:
11-11-1-280-863
11-11-1-264-196

Measure the IM shaft diameter, chuck the bearings up in a lathe, slow speed,
cut to initial size. Use a standard cam bearing installation tool and install
them in the block, they will crush and become smaller then the diameter of the
shaft. Hand finish with a brake cylinder hone, low speed and a little goes a
long ways. Test fit, finish sizing with green scotch brite. Oh ya, make sure
the front bearing lines up with the oil feed hole from the #1 main bearing
feed (The second bearing does not matter as it is fed through the shaft from
the front journal)

You want about .001-.0015" clearance, I would say .002" max Anything more then
that and you risk loosing too much oil pressure.

Thanks your most helpful as always.

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