"Lucky Max" Oil Pressure Instrumentation.

[hsburt]

The attached photo shows the Oil Sensing Unit (I think) which I want to replace as I am not sure of the age.
Unfortunately, the cost is somewhere around $150 plus taxes.

Given that the boat engines has no computer gear etc, this reading goes directly to a gauge and nowhere else.

Is there an alternate, cheaper route to take?

Also, what is the range on the oil pressure for the 6.2 please?

Thanks

Steve Burt
East Petpeswick, Nova Scotia
31’ Sport Cruiser
“Lucky Max”

[john8662]

I'd think that the sender from any 82-87 C10 C20 6.2 Diesel Pickup would net you the sender, this sender will only have one prong/connection.

The sender you have now is an Oil Pressure Switch and Oil Pressure Sender, it was used (from what I gather) on 89-91 6.2's installed in GMT400 series chassis (new body style) as opposed to the 81-87 style square body.

The oil pressure rage is typically 0-75psi. Normal running is 50-60psi at 2k+ RPM and around 35-40 at idle. They always vary though, some run at 20psi idle and 45 running 2k+ plus.

J

[hsburt]

Excellent information John. What is a good idle RPM please?

[john8662]

650-750 Idle

[DmaxMaverick]

Idle speeds can vary for marine applications. Much depends on the drive type. If the drive is hydraulic, the idle is not critical. Normally, it's best to set the idle as low as it will run smooth with minimal vibration (there's a sweet spot that varies with engine configuration). A lot also depends on the drive engagement type, design of the screws(s), the static stall speed of the screws, and the drive-engaged transition idle-up smoothness. If the drive engagement has straight gears (no synchro), you want it as low as possible to minimize gear clash (too high, and it may not engage at all). Also, you don't want the idle too far above the screw stall speed, or low speed maneuvering can be an impossible feat, too low and you'll have too little or no idle rudder response. Many throttle systems include detents (or markers) allowing for disengaged/engaged drive idle and wake speeds. It's almost always best to refer to the drive manufacturer's idle RPM recommendation.