Alumarine
Captain
- Joined
- Feb 22, 2005
- Messages
- 3,695
I doubt submerging your exhaust in water is causing low oil pressure. Depending on the year of the Suburban ive seen senders failing, instrument clusters failing and worn bearings or oil pump. Pretty wide spectrum right. Senders the easiest way to start id also do an oil change with a quality oil and filter and id run 5/30 which is what anything 2000 or newer specs at. While you can run a thicker oil it was designed to run on this you actually stand a better chance at oil starvation with to thick than thin. If its a gauge issue there are on line rebuilders that will repair and program them to work without seeing a shop with that tooling. If its worn bearings it will need to be tested with a pressure gauge the labor on this is almost the cost of a reman cluster for sure more than having a sender installed.
Now on to submerging your tow vehicle. For those who might have done this. Exhaust isnt an issues. But the rear diff thats another story. You drag a boat on a hot day and back the rear diff deep enough for the vent or any other place that a possible water entry point such as an axle seal which is a couple inches lower than the center of the rear wheels. Hot rear diff hits the water and cools off fast. Any air and theres lots of it contracts requiring the vent which is usually small and often on a rubber hose plugged with dust dirt or some bugs egg sack or its actually below the water line. Water gets drawn into the rear diff and if left long enough oil will float out water will take its place. Water is not a good lubricant and it doesnt play well with gear oil. The cool part is seeing this failure first hand. We had one a long time ago he burned up a couple rear ends. Come in with half the needed oil. What happens is the water boils away and leaves whats left of the gear oil a mess and a bunch of damaged parts. No real evidence of water though. Just a topic I thought id touch on in case it helps prevent someone from landing here.
Good idea to move the breather up higher then with a length of hose and some ty-wraps..