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We’re back with our third segment of the Jesel camshaft timing belt installation. If you spin the pages back in your browser, you’ll see the first article in the series dealt with clearancing the cylinder block to fit the Jesel timing cover valley plate. In the second installment we fit the camshaft with a special cam adapter, installed the rear thrust bearing and installed the camshaft. This time around we’ll show you how to shim the cam pulley adapter, and we’ll also dig into installing the crank pulley. Here’s how it goes together:
The camshaft pulley adapter has a second thrust washer on the front side. It is held in place by way of a machined thrust plate that fastens to the 6 studs on the timing cover valley plate. Sandwiched between the thrust plate and the timing cover valley plate are a series of thrust shims. Jesel supplies three different thrust shims. You have to juggle these in order to attain a thrust clearance of between 0.008-inch and 0.012-inch. With this arrangement, you might need one shim, a combination of two shims or all three. To check the camshaft thrust, a dial indicator is set up so it reads off the nose of the cam adapter (see the following photos).
Once the camshaft thrust measurement is set, the shims are sealed (by way of a thin coat of silicone sealant) and the thrust plate is reinstalled. The six lock nuts are re-torqued to 96 inch/pounds or 8 foot/pounds. At this point, you can move on to the install of the crankshaft pulley.
Before the crankshaft pulley is driven on, a crankshaft cam drive sprocket key must be installed and the crank snout should be covered lightly with a quality anti-seize compound. At this point, the lower should be aligned and driven into place. Jesel makes a pretty cool crank pulley driver just for this job (see the following photos). Installation isn’t tough. Just be sure to drive it on until the pulley seats against the crankshaft.
Next issue, we’ll wrap up the installation with info on how to set up and install the cam pulley along with the drive belt. Watch for it.
Apply a thin film of oil to the outer bronze thrust washer. It measures 2.950-inch on the OD and 2.260-inch on the ID, and is 0.031-inch thick.
Install the thrust washer over the nose of the camshaft pulley adapter, as shown here.
Included with the Jesel belt drive kit is a set of thrust shims. They measure 0.010-inch, 0.015-inch and 0.020-inch thick. Place all three over the nose of the camshaft, then carefully install the camshaft thrust plate and seal combination. These shims are installed dry (no oil). Be careful to ensure the seal isn’t damaged by the cam adapter keyway.
With the thrust plate installed, install and torque the lock nuts to 96 inch/pounds (8 foot/pounds). Check the endplay by setting up a dial indicator on the face of the camshaft adapter (as shown here). Move the cam front to back and adjust the shim pack (removing and/or adding the combination of shims) until you achieve an endplay measurement of between 0.008-inch and 0.012-inch.
Remove the thrust plate and shims. Next, apply a thin coat of RTV sealant between the respective shims to prevent potential oil leaks. Reinstall the shims, along with the thrust plate, and re-torque the nuts (96 inch/pounds or 8 foot/pounds). Jesel advises you to keep the seal area free of oil.
Apply a thin film of RTV sealant on the chamfer of the bottom pulley. Also apply a thin film of RTV on the adjoining crankshaft mating surface.
Lubricate the crankshaft snout with anti-seize compound. Next, slide the lower pulley over the crankshaft, aligning the keyway on the pulley with the crankshaft lower cam sprocket key. Drive the pulley on to the crank to a point where it seats (stops) on the crank. We’re using a Jesel pulley driver (part number TOL-39310) for this job.
Here’s the complete lower pulley installation.
Jesel advises that if and when the pulley is removed, a puller should be installed on the three threaded 5/16-18 holes. Do not use a jaw style puller on the pulley rings.
