Replaced Impeller with the correct size,I only get water flow at Idle. The old impeller almost did the same thing, but it got worse as I was starting the motor as I was fixing other neglected things. Someone replaced this impeller years ago and motor was then moth balled. That person don’t remember too much about his process. So there is the possibility that he left some parts out. (maybe not as a non related item to use as an example, as follows , the drawing which is attached shows an o ring for the tip of the drive shaft, this one did not have one and the merc mechanic confirmed my unit does not have one. ( so as usual I guess the parts diagram can vary in accuracy for a lot of reasons. )
MY QUESTION WILL BE, IS THERE ANYTHING ELSE THAT GOES IN THIS WATER PUMPS PLASTIC GUIDE TUBE.
I HAVE TAKEN IT APART TWICE THE IMPELLER IS GOOD AND IS PUMPING ENOUGH WATER TO KEEP IT FROM BURNING UP. I HAVE DRIVEN HIGH PRESSURE AIR THROUGH FLUSH HOLE AND UP WATER PICK UP TUBE INSIDE THE UNIT AND BACK DOWN THROUGH THE PEE HOSE AND REVERSED THIS PROCESS AND CLOSED OFF ONE OPENING AT A TIME TO FORCE MORE CONCENTRATED FLOW THROUGH ISOLATED AREAS, COVERED AREAS WITH A WIRE STRAINER, FOUND NO RESTRICTIONS, THEN RAN MOTOR WITH A HOSE HOOK UP THROUGH GARDEN HOSE WHILE MOTOR WAS STILL IN A WATER BARREL Checked for a exhaust cavitation from exhaust interfering with water pick up intake.
Etc etc . same problem still remains. Also The impeller is not rotating on a worn key way.
Here is what my problem may be, so if someone can shed some light on this I would appreciate it. This comes from me watching you tube videos on installing impellers. This one fellow had a damaged water pick up guide tube that was bad and he was going to reuse it stating that it is really not needed as some people leave them out all together when they install impellers. Now I did not go that far but it did cause me the mind set that there does not have to be a tight fit from the plastic pick up tube to the copper tubing up to the power head. There is some type of a seal in there on the attached drawing, mine does not seem to have one and my guide tube fits down in the water pump housing where it seems it is suppose to by verifying the discoloration of the exposed part of the tube. I do not see in my guide tube opening anything like part number 38. The drawing shows 2 part number 38”s
So do I need these parts to stop a pressure loss or is it something my motor does not have, or the last guy left it out. What does the part look like? I am thinking that if it is just an o ring and not some type of a seal with a catch lip on it . then it would just be forced up the copper tube and blow out of the way and be useless. Or is it just a general type o ring that I can take off the shelf at a hardware store.
Thx
SORRY CAN'T PASTE IN THE ENGINE DIAGRAM. BUT THIS IS A 1973 7.5 HP SER NO 3731914
MY QUESTION WILL BE, IS THERE ANYTHING ELSE THAT GOES IN THIS WATER PUMPS PLASTIC GUIDE TUBE.
I HAVE TAKEN IT APART TWICE THE IMPELLER IS GOOD AND IS PUMPING ENOUGH WATER TO KEEP IT FROM BURNING UP. I HAVE DRIVEN HIGH PRESSURE AIR THROUGH FLUSH HOLE AND UP WATER PICK UP TUBE INSIDE THE UNIT AND BACK DOWN THROUGH THE PEE HOSE AND REVERSED THIS PROCESS AND CLOSED OFF ONE OPENING AT A TIME TO FORCE MORE CONCENTRATED FLOW THROUGH ISOLATED AREAS, COVERED AREAS WITH A WIRE STRAINER, FOUND NO RESTRICTIONS, THEN RAN MOTOR WITH A HOSE HOOK UP THROUGH GARDEN HOSE WHILE MOTOR WAS STILL IN A WATER BARREL Checked for a exhaust cavitation from exhaust interfering with water pick up intake.
Etc etc . same problem still remains. Also The impeller is not rotating on a worn key way.
Here is what my problem may be, so if someone can shed some light on this I would appreciate it. This comes from me watching you tube videos on installing impellers. This one fellow had a damaged water pick up guide tube that was bad and he was going to reuse it stating that it is really not needed as some people leave them out all together when they install impellers. Now I did not go that far but it did cause me the mind set that there does not have to be a tight fit from the plastic pick up tube to the copper tubing up to the power head. There is some type of a seal in there on the attached drawing, mine does not seem to have one and my guide tube fits down in the water pump housing where it seems it is suppose to by verifying the discoloration of the exposed part of the tube. I do not see in my guide tube opening anything like part number 38. The drawing shows 2 part number 38”s
So do I need these parts to stop a pressure loss or is it something my motor does not have, or the last guy left it out. What does the part look like? I am thinking that if it is just an o ring and not some type of a seal with a catch lip on it . then it would just be forced up the copper tube and blow out of the way and be useless. Or is it just a general type o ring that I can take off the shelf at a hardware store.
Thx
SORRY CAN'T PASTE IN THE ENGINE DIAGRAM. BUT THIS IS A 1973 7.5 HP SER NO 3731914