Oil pressure sending unit

[Nivekt]

Is there a difference between marine oil pressure sending units manufactured by companies like Sierra and their automotive equivalents? The marine units seem to be double the price of the ones bought from say, Jegs or Summit.

Here are the examples I'm talking about:

Marine Unit:
Oil Pressure Sending Unit - Sierra OP24891 - iboats

Jegs unit:
Sunpro CP7577 Sunpro Retro Line Gauges

I would think that as long as the fitting types are correct I should be fine going with the auto version.
Thanks for your help with this.

 

[Lyle29464]

Re: Oil pressure sending unit

I dont know if they are the same ohms. But the Dual station Sierra sender is for 2 gauges. ( will not work on single station)

 

[Nivekt]

Re: Oil pressure sending unit

I dont know if they are the same ohms. But the Dual station Sierra sender is for 2 gauges. ( will not work on single station)

Okay, so if I only have one gauge then I need to be looking for a sender that specifically states it is for single station?

 

[jimbo_jwc]

Re: Oil pressure sending unit

Boats don't have shocks , Might be made to different specs and auto one you might be adding price of hose bib/barb .

 

[Nivekt]

Re: Oil pressure sending unit

Boats don't have shocks , Might be made to different specs and auto one you might be adding price of hose bib .

What? And marine part manufacturers might be looking to line their pockets based on supposed "marine" spec equipment. Internet forums are here for sharing learned information for the benefit of all. Not spreading ignorance.

 

[jimbo_jwc]

Re: Oil pressure sending unit

Plumbed hot water line out of thermostat housing and hung filter out 6" SCH 20 nipple it broke 2nd time out from weight and pounding. Talked to marine mech and got skinny. Brass heavy close nipple in place of steel long one .Marine is the only way to go and when you have problems you hope it wasen't because of you being thrifty/cheap as its hard to fight fires/leaks at close quarters when your way out on your boat with no one around or land insight.Try paddeling or throwing grappiling hook anchor to keep from going down river. Found stuff in boats I bought before and wondered what use they had . I wish this site had little box with ABC and check mark in post menu bar for spellcheck aw someone invented it and wants compensated.P.S. Not spreading ignorance or spelling skills just experiance.Haven't met any person that I couldn't learn something from even parrots .

My guard dog /alarm is better than rott and chickens and when its quite in woods be aware Grandpa allways said. Heck when oil gets pumped all out over savings in cost your oil pressure alarm will save you but wasen't tested or used and I always watch my oil pressure gage and don't need bottom alarm on fish finder and 7 foot of water over reef is safe except on days with strong wind and waves as i have kept marine parts suppliers in bussines for years learning the hardway .

 

[tahoejag]

Re: Oil pressure sending unit

A small portion of parts are interchangable (as mentioned on this forum), i.e. filters, oil, u-joints....(various parts can be cross referenced to marine application thru NAPA)..and some are not and/or cannot, partly due to being corrosive resistant in salt water applications and the metals they are made of and another more important part is being fire/flame resistant! An example - I have used an auto t-stat before and haven't had any issues (and 2/3 cheaper), however I boat in fresh water where corrision is very minimal vise a saltwater ran engine would go with marine application where corrision is a bigger factor.

If u get a cross reference for your oil sending unit...why not?

 

[jimbo_jwc]

Re: Oil pressure sending unit

I agree with NAPA cross reference as they had stock Case tractor parts , RX7 spark plugs like ones in 120hp Chyrsler, Onan Generator parts and even Summit Racing had marine fuel pumps I couldnt get elswhere. Just price won't let you put on a plane no mater what the sales guy will tell you.

 

[Nivekt]

Re: Oil pressure sending unit

I cleaned off some of the paint and found some part numbers stamped on the sender. 02504(which is the part number) and 80(which is for 80psi). After searching around a bit I found that a company named Datcon makes senders under this part number. The only problem is that there are a few variations of the 02504 model. They are listed as AC, 24VDC, and 10-180 ohms(VDO Match). Does anyone know which of these variations I would need on a boat as old as mine? Im sure the variations have something to do with my gauge. Would the information I need be on the gauge?

 

[Silvertip]

Re: Oil pressure sending unit

You are finding out that marine and auto parts DON'T ALWAYS match. U.S. marine fuel, temp, and oil pressure senders typically are 33-240 ohm resistive elements. The auto part you saw will not work because of this but since it mentions VDO which IS a EUROPEAN marine instrument manufacturer that sender might work for that series of gauges. You need to understand this stuff before trying to put an auto part on a boat. As was mentioned, other reasons might be the KABOOM factor by attempting to install an auto fuel pump on a marine engine, or worse, installing an electric fuel pump in place of a mechanical where the proper wiring practices have not been followed.

 

[Nivekt]

Re: Oil pressure sending unit

You are finding out that marine and auto parts DON'T ALWAYS match. U.S. marine fuel, temp, and oil pressure senders typically are 33-240 ohm resistive elements. The auto part you saw will not work because of this but since it mentions VDO which IS a EUROPEAN marine instrument manufacturer that sender might work for that series of gauges. You need to understand this stuff before trying to put an auto part on a boat. As was mentioned, other reasons might be the KABOOM factor by attempting to install an auto fuel pump on a marine engine, or worse, installing an electric fuel pump in place of a mechanical where the proper wiring practices have not been followed.

Thanks for the information. I am well aware of the lack of interchangeability between marine and auto parts. But to make the assumption just because something has "marine" stamped on it doesnt make sense. I am here to understand WHAT the difference is between a marine oil pressure sender and an auto one. Thanks for helping to fill in at least a little bit of that information. I guess the only thing to do now is check out my gauge.