Howdy folks,
I have a Dixon with a locked B&S 28Q777 that I'm replacing with the recommended B&S 33R877-0003, with instructions to reuse the flywheel and alternator from the old engine. The Dixon was given to me by good friends, elderly lady who's husband had drained the oil for an oil change and forgot to add new oil, so it locked up tight next time she tried to mow with it.
The old engine has a 16 amp alternator and the new only a 9 amp. Thus the reuse of the old parts on the new engine. So, I've swapped the alternator and voltage regulator and was putting the old flywheel on when the thought occurred to me to lay both flywheels side by side and compare them. I immediately noticed that the outside magnet that sits on the rim of the flywheel to fire the magneto coil is in a different orientation compared to the flywheel sheer key slot. I mean it is way off, maybe a third to half way around the flywheel compared to the old one. I verified that I'm not insane and laid a screwdriver against it to make sure I was looking at the magnets on each of them and the screwdriver snapped up against it like it should on both.
It seems to me that if I install the old flywheel on the new engine the spark timing would be way off, right?
So, I flip both flywheels over and inspect the alternator magnets and they seem to be identical in size, and in researching this last night I read on the B&S Alternator replacement guide "The 9 and 16 amp regulated systems use flywheels with the large alternator magnets." The old engine is 16 A and new engine is 9 A.
It would seem to me that I could use the 16 amp alternator from the old engine and the new flywheel in combination since the alternator magnets are the same size and the engine timing would then be correct, right? (I didn't want to install the old flywheel just to see if it worked because I believe having the timing that far off could potentially cause damage??) Have any of you experienced something similar?
I've asked this question on the B&S support Q&A as well as sent the support techs a message asking the same question. Just thought I'd try here and see if anyone has experience with this.
Thanks in advance!
fergy
I have a Dixon with a locked B&S 28Q777 that I'm replacing with the recommended B&S 33R877-0003, with instructions to reuse the flywheel and alternator from the old engine. The Dixon was given to me by good friends, elderly lady who's husband had drained the oil for an oil change and forgot to add new oil, so it locked up tight next time she tried to mow with it.
The old engine has a 16 amp alternator and the new only a 9 amp. Thus the reuse of the old parts on the new engine. So, I've swapped the alternator and voltage regulator and was putting the old flywheel on when the thought occurred to me to lay both flywheels side by side and compare them. I immediately noticed that the outside magnet that sits on the rim of the flywheel to fire the magneto coil is in a different orientation compared to the flywheel sheer key slot. I mean it is way off, maybe a third to half way around the flywheel compared to the old one. I verified that I'm not insane and laid a screwdriver against it to make sure I was looking at the magnets on each of them and the screwdriver snapped up against it like it should on both.
It seems to me that if I install the old flywheel on the new engine the spark timing would be way off, right?
So, I flip both flywheels over and inspect the alternator magnets and they seem to be identical in size, and in researching this last night I read on the B&S Alternator replacement guide "The 9 and 16 amp regulated systems use flywheels with the large alternator magnets." The old engine is 16 A and new engine is 9 A.
It would seem to me that I could use the 16 amp alternator from the old engine and the new flywheel in combination since the alternator magnets are the same size and the engine timing would then be correct, right? (I didn't want to install the old flywheel just to see if it worked because I believe having the timing that far off could potentially cause damage??) Have any of you experienced something similar?
I've asked this question on the B&S support Q&A as well as sent the support techs a message asking the same question. Just thought I'd try here and see if anyone has experience with this.
Thanks in advance!
fergy