Thread: F100: Did I find something here?

You are right.
There is no gasket below the ride plate.


Sent from my iPhone using Crappie.com

Originally Posted by CrappiePappy

Something along these lines might have happened with the previous owner ....

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.

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

Originally Posted by bamahound

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.

Perfect, that's why I like & use pictures too.

Originally Posted by Rojo

Perfect, that's why I like & use pictures too.

Expanded view pics always help, except when it's a copy of a pic, which is a copy of a copy, and one of the copies had too much toner...Makes for a bad copy..

Originally Posted by Slab

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.

With the gasket placed as you describe there is no way it could pump water.

Originally Posted by Barnacle Bill

With the gasket placed as you describe there is no way it could pump water.

Exactly my point. Maybe a little at wot but I never seen it pump water, until at least I fixed it. I just now ran it, and I got water! Yay
I also got oil pressure. But it still runs poorly. I’ll post a video of it hopefully soon.



Runs like garbage...part two