Offshoreonly.com - 2012 8.2 help

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)

- - 2012 8.2 help (https://www.offshoreonly.com/forums/general-boating-discussion/365856-2012-8-2-help.html)

^^^^^^^^^ I think he mentioned he replaced that with the newer Merc one ?? Id so that is good because the diameter is slightly bigger. ^^^^^^^^

Quote:

Originally Posted by TYPHOON (Post 4734210)

s/n 2a042709

I just seen this - Ill run it tomorrow

Quote:

Originally Posted by lightspeed (Post 4734250)

Randy did u check the fitting thats in the gimbel that the hoses hook to... Bravo fever ??? that closes up over time and restricts flow

Being that new I would bet it has the new transom hose which is not rubber and doesn't close up
https://www.mercruiserparts.com/8m0090859-hose-kit

Our latest test was the pop it valve under the manifold. That's not the issue either. I give up and he set an appointment with a dealer.

Is there any thing in the fuel cool system that could do this?

Its probably best to go to the dealer

Don't see the cool fuel causing the issue, it takes in and lets out at same location, so net some zero so far as pressure change.

The pressure sensor is on the PS cooler, and note the Tee going to the poppet valve is just before it. If the poppet valve stays open then pressure is reduced

https://cimg3.ibsrv.net/gimg/www.off...83fd251504.jpg

Quote:

Originally Posted by BUP (Post 4734093)

possible poppet valve issue

Sensor ground and or harness issue ???

does the psi reading ever change --- Also What is water pressure psi with just key on engine not running ( KOEO ) and at idle and so on for rpms ? if the engine goes into guardian mode what fault codes pull up ? What is water pressure psi readings when it goes into guardian mode ?

These are a CAT engine and the cooling set up and exhaust is not that same standard set up.

ENGINE SERIAL NUMBER -- you can text it to me. Also there is possible PCM updates most likely for this engine if it has not gone back to a Merc dealer. There is many very long Service bulletins for the earlier 8.2 CAT engines. heck one is 30 pages long.

With that said engine serial number is a must and this will determine water flow / parts diagrams

2 of the best tests you can do is clear water hose testing in sections of the cooling system especially from inner transom and forward from there. Also water output tests after the sea pump outlet. Do not run long because of the cats in the exhaust. 15 seconds MAX to compare water flow output one engine vs the other.

Sea pump GEN VII internally scared not pulling enough water -- I WOULD DOUBLE CHECK THAT first and foremost and water output testing can help determine that as well

Have you checked out the top 2 answers I mentioned here.

The poppet valve

sensor ground / sensor / harness / sensor connector issues ? I added more here to possible pin point a issue.

I did run your engine serial number. I have to go back and pull all that up.

Yes we by passed the poppet valve and replaced the sensor, checked connection. No I did not check the sensor ground. Where would that be at?

Ill private message you