Black Snow Slide
Petty Officer 1st Class
- Joined
- Jun 15, 2007
- Messages
- 276
I have a 2007 VP 5.7 GIF. Motor has 390 hours and mostly salt water use. The motor has a heat exchanger but the manifolds and risers are not part of that loop. The motor is flushed with fresh water after every time it is used. I have not flushed with salt away.
This spring after my second run I noticed a small rust line from one of the corners where the riser and manifold come together. No rust marks in the bilge. Other side is clear from what I can see. I took my lazer temp gauge and looking at temps of the manifolds and risers I am finding temp variances of 15-30 degrees on the risers and 20-40 degree variances on the manifolds. Also, when flushing the motor I am finding one side has 1/3 the water flow through the exhaust port then the other. The side with the low water flow corisponds with the side with the rust stain.
I took off the hose that feeds cooling water to the manifolds and gave them a hard flush to clear and mess that may of been sucked into the raw water intake. With the hose disconnected, I stated the motor running on the muffs and water flow is equal on both sides.
I am wanting to change both risers and manifolds rather then taking off the riser, scraping inside, then reinstalling with new gasket. Why do all that work when I am half way into the replacement process?
I have never done this job before. I have bought a can of CRC freeze blaster and have been spraying all bolts every evening for 4 days. Any advice, tips, tricks, cautions, or advise would be great. I am 50/50 on if I want to attempt or give it to my marine mechanic.
This spring after my second run I noticed a small rust line from one of the corners where the riser and manifold come together. No rust marks in the bilge. Other side is clear from what I can see. I took my lazer temp gauge and looking at temps of the manifolds and risers I am finding temp variances of 15-30 degrees on the risers and 20-40 degree variances on the manifolds. Also, when flushing the motor I am finding one side has 1/3 the water flow through the exhaust port then the other. The side with the low water flow corisponds with the side with the rust stain.
I took off the hose that feeds cooling water to the manifolds and gave them a hard flush to clear and mess that may of been sucked into the raw water intake. With the hose disconnected, I stated the motor running on the muffs and water flow is equal on both sides.
I am wanting to change both risers and manifolds rather then taking off the riser, scraping inside, then reinstalling with new gasket. Why do all that work when I am half way into the replacement process?
I have never done this job before. I have bought a can of CRC freeze blaster and have been spraying all bolts every evening for 4 days. Any advice, tips, tricks, cautions, or advise would be great. I am 50/50 on if I want to attempt or give it to my marine mechanic.
