One little thing is missing. After installing the belt I would recommend rotating the crankshaft manually two revoloutions in order to make sure the pistons will not hit the valves when firing up the first time. John, your videos are actually the best outboard how-to-videos out there. Very good explanation, but also very good audio quality, pronunciation and talking speed. Makes it easy to follow even for non-native English speakers.
As someone who's been a professional mechanic for a very long time and has seen many broken timing belts I can tell you that you cannot inspect a timing belt to see if it's going to break or not. I've seen timing belts that looked brand new break and I've seen timing belts that look like they should have broken years ago still working fine.
Great video. I usually turn the motor a couple of times in the correct rotation by hand to ensure marks are 100% lined up.. What holds the flywheel is a nut not a bolt,in my neck of the woods...
Good video John. My 25 Yamaha 4 stroke stopped and won't restart.The compression on both cylinders is only 75# and the timing belt is very loose.Could it have jumped time or is it something more serious. Thanks
If your engine was running when it "jumped time" then the crankshaft and the camshaft became out of phase/time at some point. John mentions this issue in passing during this video. When the crank and camshaft are not synchronized (out of time/phase) the valve(s) are likely to be still in the open position when the piston comes up to top dead center at some point. This is a problem because if yours is an "interference" engine meaning there is NOT enough room in the top of the piston chamber for both the piston and the valve(s) being in the open position to happen at the same time-one or the other but not both at the same time, then impact and damage occur. Damage happens when the piston(s) hits the valve(s) damaging/destroying the valve, piston and possibly the piston chamber. With that low of a compression this may have occurred. You could do a "leak down" test to determine where the leakage is occurring; one or both valves, the head or someplace else, but that requires some more equipment. Hope it helps-
One little thing is missing. After installing the belt I would recommend rotating the crankshaft manually two revoloutions in order to make sure the pistons will not hit the valves when firing up the first time.
John, your videos are actually the best outboard how-to-videos out there. Very good explanation, but also very good audio quality, pronunciation and talking speed. Makes it easy to follow even for non-native English speakers.
As someone who's been a professional mechanic for a very long time and has seen many broken timing belts I can tell you that you cannot inspect a timing belt to see if it's going to break or not. I've seen timing belts that looked brand new break and I've seen timing belts that look like they should have broken years ago still working fine.
The true professional makes it look EASY. Thank you John!
Great video. I usually turn the motor a couple of times in the correct rotation by hand to ensure marks are 100% lined up..
What holds the flywheel is a nut not a bolt,in my neck of the woods...
Great video john thank you I have this job ahead of me this week watching from southern Ireland 🇮🇪 😀 👍
Thanks. This was clear and just what L needed
Thanks for the video!
Very cool video, i love the tf2 logo
very nice ,I will do the same procedure by my Yamaha F50
Hi. How do you know that you are giving the belt enough tension with the manual adjustable idler tensioner ?
Great Video
What size of 3bolts on flywheel ? M6 or m8?
you need to do one with the inline double overhead cam
Why’s the flywheel at the top of the engine and not at the business end, where it meets the transmission ?
I pulled the timing belt of with out line it up top dead center so what do I do it's a Yamaha f150xl 2018????
Super nice thanks
Shouldn't you also change the tensioner...
Does the same procedures apply for replacing the timing on the 75 hp Yamaha
Can you post the information on the tool that you used to hold the fly wheel in place
do you have the one for mercury?
Good video John. My 25 Yamaha 4 stroke stopped and won't restart.The compression on both cylinders is only 75# and the timing belt is very loose.Could it have jumped time or is it something more serious. Thanks
If your engine was running when it "jumped time" then the crankshaft and the camshaft became out of phase/time at some point. John mentions this issue in passing during this video. When the crank and camshaft are not synchronized (out of time/phase) the valve(s) are likely to be still in the open position when the piston comes up to top dead center at some point. This is a problem because if yours is an "interference" engine meaning there is NOT enough room in the top of the piston chamber for both the piston and the valve(s) being in the open position to happen at the same time-one or the other but not both at the same time, then impact and damage occur. Damage happens when the piston(s) hits the valve(s) damaging/destroying the valve, piston and possibly the piston chamber. With that low of a compression this may have occurred. You could do a "leak down" test to determine where the leakage is occurring; one or both valves, the head or someplace else, but that requires some more equipment. Hope it helps-
Please whats the name of the tool you used to hold the flywheel steady while you tighten the flywheel nut?
thx
Do you have app for your website it might be easy for shopping
Muito bom
Parabéns
Good!
👍
Boats . Not defenfently gonna check yall out
What do you charge?
Is this "interference" or "non interference" engine?
Interference. If it was a non he wouldn't be worried about the valves meeting the piston
225
Спасибо всё понятно 👍👍👍