Re: evinrude lark info
Freddyray21, thanks for the lead. I follow it.
Ok, after the morning hunt we found some ?shop time? and here is our progress report. We got the rest of the power unit tore down yesterday and were pleased to see that the only thing that keep us from turning it over (reason it was frozen) was the lower cylinder was rusted to the cylinder; this is just as we suspected (and hoped for when we pulled the head off earlier last week. Other than one striped bolt (had to cut the head off) on the exhaust manifold cover we don?t see any other show stoppers. We are pleased because these were no catastrophic causal factors such as broken rod or crank.
Here is the question: How did water (assuming it was water that created the rust weld) get into that cylinder? I don?t see any leak path evidence across the case to head sealing surface. I hope there are not cracks but?.again what caused the rust weld? Could a flooded (fuel flooded) cylinder that was never cleared cause this over time?
The top two rings of the lower piston are stuck in the ring grooves and we have not soaked them in anything yet to free them up. Do you think soaking it in carburetor dip would do us any good? FYI we soaked the piston in the cylinder bore for 5 straight days with PB Blaster penetrating fluid and still had to push it in (down) and clean up the bore a bit before we could get the piston to move ?up?. Pistons overall don?t look to bad. Upper piston?s rings are all floating as should be but there is a vertical scuff about ?? wide on it the skirt. The tops of these pistons are funny looking, wonder what the intent of the asymmetrical dome design was.
The caged roller bearings in the connecting rod crankshaft end look like they may be challenging to reinstall. It also appears there is some sort of caged (and hopefully retained) roller bearing gin the wrist pin end also.
Roughly speaking here is the list of parts and work that I think we need and know of so far. Our decision to move forward on this project is dependent upon the cost to satisfy the needs shown below. If anyone knows of any sources please advise. I have read enough in these forums to see a lot of recommendations to check the Johnson/Evenrude dealers so I will not overlook them as I start making inquires.
1) Cylinder bores honed or possibly bored over size (bore work will defiantly require O/S Piston and rings
2) Have case and head non destructive tested to check for cracks from water jacket.
3) Possible case depending on how deep the pitting in the lower cylinder bore ends up measuring and results from NDT.
4) Possible Piston (will know more once we free up those rings and get them off and determine piston serviceably.
5) Piston Rings
6) Polish crank journals (possible)
7) Possible connecting rod {don?t see any damage but we had to hit (with wood block and hammer) on something to get that piston moving}.
8) Overhaul Gasket and Seal Kit
9) Carb rebuild kit
10) Plugs, plug wires and points and fuel line
11) Overhaul / Service manual.
Anyone see anything blearing at them that we are missing here? I got to let you know that I am not a professional machinist or an engine mechanic. My knowledge and skills are learned through years as an automotive hobby enthusiast. There are lots of gaps that hopefully you all can help me fill. By the way, this is my first marine project so?.thanks in advance for any help, guidance and direction you can provide.
Oh, yea, with the exception of a few (very few) odd ball bolts and fasteners, all that was needed to tear this unit down was a large SS screwdriver, and a ? and 7/16? wrenches.
Raymond.
