View source for Astron Balance shaft chain adjustment

Most [[1g_Astron_II|First Generation Astron II's]] built before 1990 require that their balance shaft chain tension is checked and adjusted every 20,000 Km. The procedure can also be performed on newer Astron II's with self-adjusting chains, but the cause of the tension loss should be investigated beforehand.

[[Image: Astron chain access.jpg |right|thumb|200px|Figure 1: Location of the cover plate]]
[[Image: Chain adjust open.jpg |right|thumb|200px|Figure 2: View of the balance shaft adjusting bolt and guide with cover removed]]
The procedure for adjusting the balance shaft chain is:
*1. Remove the adjustment cover plate (see figure 1). This is done by removing the two bolts from either end.
*2. Loosen the chain guide bolt so that you can push the chain guide. Do not completely remove it, otherwise you could drop the chain guide (see figure 2).
*3. Push the chain guide downwards using the lump just above the bolt with your fingers. Do not use a screwdriver or other implement as you will not be able to gauge the tension. Push down until it feels firm.
*4. While holding the chain guide in place, tighten the chain guide bolt.
*5. Clean the cover plate and the mating surface on the timing cover. Run a little RTV Sealant around the raised edge inside the coverplate.
*6. Reinstall the coverplate

[[Category: First Generation Workshop]]
[[Category: Second Generation Workshop]]
[[Category: Astron Engines]]