Home › Forum › Ask A Member › Johnson AD needs help › Re: Johnson AD needs help
Well, I don’t think I would go through all the trouble of finding a crank and rod, then use the old rings. You should be able to find some NOS rings without too much trouble/expense. But, if you choose to reuse the old rings, I would certainly mark them and reinstall exactly the same way they come off the pistons. You should check the ring end gap as well. Probably a good idea to measure the piston skirts, especially after replacing the one bad rod.
Unfortunately, some of your measurements may be "marginal": not out of spec, but close, forcing you to make judgement calls. These powerheads are pretty forgiving, and I’m sure the engine will run fine even with marginal fits/gaps/clearances. Please be careful trying to remove the exhaust cover screws, you sure don’t want to break any of them off. I would work on getting the exhaust cover screws out first, before hunting down new/used parts, just in case you run into trouble.