oem part numbers

[kencobalt]

Hi,
1988 cobalt 202 350 mag alpha 1 mercruiser s#ob 964882. 350 cid.

Looking for part # for water sending/temp units.1 on left and 1 on the right.
also oil temp/sending unit part #.
also where is oil unit on engine.

Thank you,
ken benfieldd

 

[stonyloam]

Re: oem part numbers

Should be here: http://www.mercruiserparts.com/Show...desc=WIRING+HARNESS+AND+ELECTRICAL+COMPONENTS This should be your engine: http://www.mercruiserparts.com/selectSerailRange.asp?doc_nbr=320+(EFI)++++GM+350+V-8+1988-1989

 

[Bondo]

Re: oem part numbers

Hi,
1988 cobalt 202 350 mag alpha 1 mercruiser s#ob 964882. 350 cid.

Looking for part # for water sending/temp units.1 on left and 1 on the right.
also oil temp/sending unit part #.
also where is oil unit on engine.

Thank you,
ken benfieldd

Ayuh,.... Welcome Aboard Ken,.... Why ya changin' All the motor's sensors,..??

What gremlins ya chasin',..??

 

[kencobalt]

Re: oem part numbers

Ayuh,.... Welcome Aboard Ken,.... Why ya changin' All the motor's sensors,..??

What gremlins ya chasin',..??

I am curious as to why there are 2 diff sending units (temp) .
Alarn on boat sometmes goes off during initial start up.
Oil pressure sending unit bad???

Thanks to all who helped on last post.i only see 1 temp sensor on drawing.
1 wire to temp on left sensor and 2wire to right temp sensor????????

Pls explain.

Ken

 

[Don S]

Re: oem part numbers

I am curious as to why there are 2 diff sending units (temp) .

There are 2 sender looking things for the oil pressure, and 2 for temp.

You have switches for the alarm, and senders for the gauge.

For temp, the alarm switch usually closes at 210? and creates a complete path for the alarm. Same with oil pressure Switch, below 3-7psi the switch is closed and sounds the alarm, above those pressures the switch is open. No alarm.

The senders for the gauge are a variable resistor that gives you different readings on the gauge, not just on and off like a switch.

Does that clear things up a bit?

 

[Pete104]

Re: oem part numbers

I'm curious about your 2 wire sender.
The sender specific for that system (audio) is listed under the "Audio Warning System" in the OEM sites.
As Don said how they work is different, but side by side they LOOK identical.
Does the wiring look like someone has changed things?

As far as the chirping you get while cranking. That's the oil audio sender going south on ya. After almost 25yrs, change it. It works on the same principle as Don explained for the temp.

 

[Don S]

Re: oem part numbers

2 wire senders are probably aftermarket switches that do not ground through the base.