Is it safe to run with the GRV disconnected ?

[Orioles66]

I have a 5.0 Merc and have pulled the hose off the valve on top of the engine I believe is called a GRV. The boat will not run with it hooked up. Will this do any damage running it this way?

 

[Master mechanic]

You want to figure out why it won't run with it hooked up, we can help you with that.

 

[Orioles66]

You want to figure out why it won't run with it hooked up, we can help you with that.

What should I check ? Replace the valve?

 

[Bt Doctur]

with the motor running place a piece of tissue paper over the hose and report the findings.Check the oil for contamination.

 

[Docksidemarineservices]

I would be checking the oil for gasoline.

 

[Master mechanic]

But it runs with the hose disconnected.

 

[Bt Doctur]

Whats a GRV? and connected it stalls the engine?

 

[bondo]

Whats a GRV? and connected it stalls the engine?

Ayuh,... I clicked this thread, hopin' to find that out,....

Maybe it's Text-talk or somethin',.....

I'm guessin' Chris nailed it, 'n the fuel pump is ruptured,...

 

[Bt Doctur]

Once had a 4.3 doing the same thing but with a miss. oil was slightly contaminated with moisture coming in from a broken exaust outer valve spring

 

[Fun Times]

I believe is called a GRV. The boat will not run with it hooked up.

Do you mean the PCV Valve?

Item # 8, http://www.mercruiserparts.com/Show...bnbr=100&bdesc=Cylinder+Head+and+Rocker+Cover

What is the year or engine serial number?

Do you by chance have the TKS carburetor? Last time I had an engine running just like you described, I ended up installing a new carburetor under warranty to solve the problem rather quickly for the customer so he could get on the road to start a 3 day holiday weekend.