you have to check the chain for stretch... i am not sure how to do it on the om 60X's... on the om 61X's you take the valve cover off and there are marks (inaccurate but an avg is acceptable) or use a dial indicator.

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto