6.2 oil pressure ..

[Whitey]

I have a question for you fellow merc. 6.2 owners.. Do you seem to have low oil pressure once the engine is warmed? I went all summer with the problem and inquired to merc and they gave me the 4psi minimum crap at idle. I am just not used to that and was wondering if anyone else was having the same situation? Thanks Dwight

[RiverAddict]

I experienced the same situation when I installed my new 6.2 last summer. I was also told it was normal.

[moomba]

You must be using a multi-grade oil or synthetic - right? Try using a sae 40w or the merc 25-40

[Whitey]

I will try a straight 40 in the spring to see what happens. I thought about replacing oil pump with a high volume and see if it helped but, it is alot of work to do it. Thanks for the replies Dwight

[Well Done]

Whitey,
I use 50wt Valvoline Racing Oil. Works great but you must remember that warm up does not mean idle to the wake buoy then WOT. 50wt racing should bring up the pressure.

[Whitey]

I will try in the spring, Why do you suppose mercruiser set the pressure so low?

[Scarab Fast]

I have this problem with a 383 motor I just built. When investigating this to see what may be causing it I found the oil filter was so hot you could not hold onto it. While the oil is cool the oil pressure stays around 40lbs then when it gets hot it drops off to about 10-12lbs. This worries me that the oil is to hot to do its job fully. I am going to install an oil cooler in the spring before I run it any more. You guys may check your oil temp. as well to see if it is getting hot and causing your press. to drop off.

[Nokomis]

I would make sure that using an oil other than whats recomended won't create a warranty problem down the road. What about installing an external oil cooler? Cooler oil=higher viscosity?

[Whitey]

Can you guys give me a direction to an oil cooler application. I know the 6.2s do not have them and I thought that I would love to install, I am not sure what type or brand would work best. Also I am considering some exhaust what are you guys running? Do you guys know if bbc exhaust risers can fit on the sbc manifolds? Thanks Dwight

[Whipple Charged]

It is a problem, theres no oil cooler, the motor only has a 4qt oil pan, you can do the math. I've seen the 4psi in the manual, what the hell? At 5200rpm, 4psi is not enough psi, especially under a long sustained throttle period.
Note that we had a customer with dual motors that ruan 14lbs. of boost, 38 total timing, 6200 rpm for long periods with stock bottom end, stock pistons, etc but the few things that were changed was the pan (10qt Olson) and a oil cooler from Rex Marine, never had oil psi problems!
Dustin

[Scarab Fast]

Mercruiser offers several different oil coolers. I am a dealer for them but dont have my book in front of me right now. The oil cooler will go inline with your water inlet hose, the hose that brings water to you motor from the outside. You probally have a power steering cooler there now, Most all new boats with v6 and v8s come with one in place. If you do not have one already you will need a oil filter relocater which in most cases moves the oil filter up to the port manifold riser. There is a bracket that will mount down to the riser where the front two bolts hold the riser to the manifold, your oil filter will screw on here, and you will have oil lines run down to the bracket that is in place of the original oil filter location. With the oil cooler one line will go in to it and then to the bracket. Mercruiser makes a unit that is a oil and power steering cooler all in one or they make seperates. The one I am looking at using comes on 502 engines, it is the biggest one they sell. It is a oil and steering cooler in one. It list for about $200, cost about $120 I think. I will check to see if they have one made for your motor. I am running ported stock manifold with stainless Imco risers, manifolds dont do much for a small block. the risers are the most restricted part of the flow. This may be more info than you was looking for.

[Whitey]

Dustin thanks for the reply, I have about 35-40
psi running it is just at idle where I have concern of the oil pressure. I am going to install cooler and I have to believe this will help. I find it disturbing that mercruiser put this wngine out without the cooler, but as long as it gets out of warrranty what do they care after that. May be an unfare statement but one has to wonder.
ScarabFast, that is exactly the info I wanted. Let me know about the oil cooler and did you use the inco risers for a bbc? is there any difference? Thanks Dwight