Something along these lines might have happened with the previous owner ....
Something along these lines might have happened with the previous owner ....
S10CHEVY LIKED above post
Sir CrappiePappy is pointing out something I will not touch on the V-6 Yamaha engines. One engine(I think it is the 225HP) is not a Interference Engine (Valves will hit the Pistons when out of time) the rest the Valve timing has to be perfect. All the points must be perfect the first time. I think the 4 cylinders like Slabs has a single tensioner but the V-6 engines you have to line up several marks before putting the belt on. Since the Cam Pulley is a Variable Valve Timing Pulley they can fail causing a Run-Out problem with the belt alignment shaving the belt at first but over time damage it like the picture Sir CrappiePappy provided. Moral of the story if you run a Yamaha V-6 remove the Cowl periodically, remove the large black plastic cover over the Flywheel, and look for black dust accumulating around the two Camshaft Pulleys. You want to catch that failure in the beginning stages. The timing belt will crawl downward too, it rubs on the block when the Pulleys begin to fail.
S10CHEVY LIKED above post
Just my 2cents on this but most diagrams for yamaha show a gaskets on both sides of the plate. On the f100 looks like top is spagetti gasket. My 2cents is late to this so I dont know the year or how long it ran b4 fail. All yamaha install manuals say rotate shaft clockwise while tighting bolts so the propellar is not jammed or installed with blades curved wrong
You are correct:
Sounds like my previous gibberish was a little confusing, which often happens! lol
Let me clarify, prior to my repairing it:
there was no gasket where number 27 is shown. And the gasket shown by 27 in that diagram was found where 29 is.
I have since installed new parts exactly as shown in that pic.
Last edited by Slab; 03-18-2024 at 04:16 PM.