1992 454 7.4 liter oil

Gjac wrote:

Itasca55 wrote:

jyrostng wrote:
"This last weekend It was in the 85f outside . temp gauge on motorhome held right at 190f with front air conditioning on . I shut it down after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave key on for 5-10 mins . Theres some serious heat in engine compartment."

Mine's a older P30 (1989). The only electric fan on mine is for the dash ac and it's controlled from the ac compressor head pressure switch, if you are running the dash air and turn the key off and right back on but not restarting the engine, the ac fan in front of the condenser will come on till the Freon pressure drops below the switches set point, something like 250psi.

OK I will have a closer look at mine.
I was thinking its running even when air conditioners off . will let you know.

Itasca55

You are both right. There is a sensor in the RH head and a wire that goes to the fan via a trinary switch, when the head temperature reaches a set temp the fan comes on, it also comes on when you turn the AC on.

Thanks makes sense that's why when I turned keey back to on position the electric fan came on . when its that hot again I will let fan run 5-10 mins try cool things down more.
Thanks for the info.
Itasca55

Itasca55 wrote:

jyrostng wrote:
"This last weekend It was in the 85f outside . temp gauge on motorhome held right at 190f with front air conditioning on . I shut it down after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave key on for 5-10 mins . Theres some serious heat in engine compartment."

Mine's a older P30 (1989). The only electric fan on mine is for the dash ac and it's controlled from the ac compressor head pressure switch, if you are running the dash air and turn the key off and right back on but not restarting the engine, the ac fan in front of the condenser will come on till the Freon pressure drops below the switches set point, something like 250psi.

OK I will have a closer look at mine.
I was thinking its running even when air conditioners off . will let you know.

Itasca55

You are both right. There is a sensor in the RH head and a wire that goes to the fan via a trinary switch, when the head temperature reaches a set temp the fan comes on, it also comes on when you turn the AC on.

jyrostng wrote:
"This last weekend It was in the 85f outside . temp gauge on motorhome held right at 190f with front air conditioning on . I shut it down after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave key on for 5-10 mins . Theres some serious heat in engine compartment."

Mine's a older P30 (1989). The only electric fan on mine is for the dash ac and it's controlled from the ac compressor head pressure switch, if you are running the dash air and turn the key off and right back on but not restarting the engine, the ac fan in front of the condenser will come on till the Freon pressure drops below the switches set point, something like 250psi.

OK I will have a closer look at mine.
I was thinking its running even when air conditioners off . will let you know.

Itasca55

"This last weekend It was in the 85f outside . temp gauge on motorhome held right at 190f with front air conditioning on . I shut it down after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave key on for 5-10 mins . Theres some serious heat in engine compartment."

Mine's a older P30 (1989). The only electric fan on mine is for the dash ac and it's controlled from the ac compressor head pressure switch, if you are running the dash air and turn the key off and right back on but not restarting the engine, the ac fan in front of the condenser will come on till the Freon pressure drops below the switches set point, something like 250psi.

What Hank says makes a lot of sense, but if you choose a higher multi viscosity oil say 10-40 or 10-50 over 10-30 wouldn't the higher engine temps dictate the viscosity? Also on these older well worn 454's that some of us have benefit from these higher multi viscosity oils? I saw no difference in engine temps when I switched from regular oil to syn oil.

Some people think thicker oil is better. A thicker oil may be the right choice if outside temps are high enough but not as a general rule of thumb. Some will look at the oil pressure gauge, see the higher readings with thicker oil and think that's a good thing. The pressure readings are higher because the oil doesn't flow as easily. Less flow equals less lubrication and less cooling to critical components. You want the oil circulating through the engine, providing clean, cooler oil. Not thick oil that doesn't want to move.

Check the engine manual and see what oils are approved based on temps. I would always choose a multi-weight over a straight weight oil. Outside temps are never a constant.

Itasca55 wrote:

jolooote wrote:
I had a 30'Class'A'on the Chevy P30 chassis, 454. for 14 years. After about 30,000 miles I was told to use 20w50 in it because its a hot runnin engine with sloppy tolerances. Seemed to work good. Don't forget to shield the starter motor against the dredded "Hot Start" problem. It absorbs heat when shut down and locks the plunger in place till it cools down. Great fun at gas stations. Also, when it cracks exhaust manifolds install the BEST aftermarket copper gaskets you can find.

This last weekend It was in the 85f outside . temp gauge on motorhome
held right at 190f with front air conditioning on . I shut it down
after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave keey on for 5-10 mins . Theres some serious heat in engine compartment.

Itasca55

Let it idle for a few minutes. The fan will cool whats in the radiator and some cooling to engine but the coolant is not moving. Heat is still trapped inside the engine. Idling will bring the coolant temps down both in the rad and inside the engine.

jolooote wrote:
I had a 30'Class'A'on the Chevy P30 chassis, 454. for 14 years. After about 30,000 miles I was told to use 20w50 in it because its a hot runnin engine with sloppy tolerances. Seemed to work good. Don't forget to shield the starter motor against the dredded "Hot Start" problem. It absorbs heat when shut down and locks the plunger in place till it cools down. Great fun at gas stations. Also, when it cracks exhaust manifolds install the BEST aftermarket copper gaskets you can find.

This last weekend It was in the 85f outside . temp gauge on motorhome
held right at 190f with front air conditioning on . I shut it down
after idle for 5 mins . and I noticed if I turn keey back on to part right before starter kicks in the front electric radiator fan kicks on . would this be another way to cool it more after shut down . You know leave keey on for 5-10 mins . Theres some serious heat in engine compartment.

Itasca55

jyrostng wrote:

Itasca55 wrote:

jyrostng wrote:
10w30 here for my 1989 with a quart of mobile 1 10w30 and a mobile 1 oil filter.
as for the exhaust gasket FEL-1412 Their extra good.

as for a mod to help the starter and prevent plug wires burning up and manifold cracks. http://s1114.photobucket.com/user/jyrostng/media/P30SplashShieldtextLarge.jpg.html?sort=3&o=103

I will check if my 1992 has a panel on right hand side. 3-5 mins at shut down after high way speeds sounds right on where did you find this great info.
Itasca55

The road of hard-knocks and google
That air diverter was a gm service bulletin from 1993

Thanks I will see if mine has one. I could make one I guess. Already fixed leak on exhaust manifold on drivers side.hate to think how many service bulletins I missed.

Itasca55

Itasca55 wrote:

jyrostng wrote:
10w30 here for my 1989 with a quart of mobile 1 10w30 and a mobile 1 oil filter.
as for the exhaust gasket FEL-1412 Their extra good.

as for a mod to help the starter and prevent plug wires burning up and manifold cracks. http://s1114.photobucket.com/user/jyrostng/media/P30SplashShieldtextLarge.jpg.html?sort=3&o=103

I will check if my 1992 has a panel on right hand side. 3-5 mins at shut down after high way speeds sounds right on where did you find this great info.
Itasca55

The road of hard-knocks and google
That air diverter was a gm service bulletin from 1993