4.3 mercruiser oil pressure sending unit

[81_chapparel194]

ok I probably know the answer to this but taking a shot in the dark. on a 4.3 mercruiser will a gm oil pressure sending unit work from napa or auto zone? or do I need to get one from a mercruiser dealer? I know some parts are different but some are the same as gm parts. just curious if this is one of them.

 

[Bt Doctur]

Re: 4.3 mercruiser oil pressure sending unit

It might, I tried once using the auto part and it read backwards.

 

[wrench 3]

Re: 4.3 mercruiser oil pressure sending unit

See if your auto parts store has a marine electronics catalog. I know Standard puts one out.

 

[Bt Doctur]

10 to 40 psi, it depends . type of oil, sender. gauge,wiring, accuracy. Put a mechanical gauge in to see what the actual pressure is

 

[Bondo]

Can anyone tell me what the oil pressure should be on a 97 250 hp 4.3 mercruiser at idle on the muffs ?

Ayuh,.... Welcome Aboard,.... 10 psi per 1000 rpms is acceptable,....

 

[my3girls]

Ok, thanks for the help

 

[my3girls]

Ok, thanks for the help

 

[my3girls]

Also what should pressure be when in the water not on the muff ?

 

[my3girls]

Also, what should oil pressure be when in the water not on muff's ?

 

[my3girls]

Sorry, new to forum getting used to posting/responding.

 

[Bondo]

Also, what should oil pressure be when in the water not on muff's ?

Ayuh,.... 10 psi per 1000 rpms is acceptable,....

 

[500dollar744ti]

I got a used mercruiser sending unit on ebay when mine rusted out. didn't want to chance putting in the wrong part.

 

[my3girls]

Does a 1997 4.3 mercruiser have a 250 hp ?

 

[Bt Doctur]

doubtful, post the engine serial number

 

[my3girls]

Im going to get serial # today. Gauge was put on and reads 10psi at idle on muffs.

 

[81_chapparel194]

same as on muffs maybe 5-6 pounds less with a load on it.. but shouldn't be noticable

 

[alldodge]

Gauges are gauges are gauges.... The differences are in the setup based on the senders. The North American standard is 240 ohms at Zero, and 33 ohms at full gauge reading. Most all gauges use the NA standard, but like some there are differences. Look up your gauge and see what it uses. Another option is if you change the gauges and the sender as a package then there should be no issues

 

[Bondo]

Also, what should oil pressure be when in the water not on muff's ?

Ayuh,.... Welcome Aboard,.... 10 psi per 1000 rpms is "Acceptable",.....