Your donations help keep this valuable resource free and growing. Thank you.
|
oil pressure sending unit |
Post Reply | Page <1234> |
Author | |
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
304-dude, i can jump the output wire from the sending unit to ground and the gauge works. cluster is out of the car so to speak and i did not find any broken traces. everything on the circuit board checks out.
i am trying to diagnose this and need to know if my drawing is accurate for proper operation or if i am missing something here. |
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
Your drawing is pretty much the way it works, but it is never open like a switch. That is why I wanted to see the ohm readings.
Mopar sending units look a similar yet have a higher ohm reading, thus the needle never seems to move with the AMC gauge. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
i will test it when my wife gets home to rev the engine for me. what range of ohms am i looking for?
thanks Barney |
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
About 82 ohms down to 10 ohms at 80 psi within a 10% tolerance give or take. Mopar starts somewhere above 100 ohms, not sure exactly as the info was from long ago about such issues with oil sending units. I can guess about 130 ohms. Maybe 440sixpac or Moparguy can say from knowledge. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
Post Options
Thanks(0)
|
that is good, but you also need a solid electrical connection from block to chassis. AMC used an uninsulated braided ground strap, in various locations, usually near/around a motor mount. battery-negative+engine+chassis need to be electrically one. |
|
1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
|
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
tomj, the block is grounded to the chassis.
|
|
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
i finally got my tach back and had a chance to check the sending unit. i am getting 72 ohms at idle and it goes down to 60 ohms at about 2500 rpm. this is with the wire disconnected from the sending unit.
i am wondering if my cvr is bad. |
|
401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5370 |
Post Options
Thanks(0)
|
What are you working on?? Model and year....there are 3 different specific sending units for dash gauges.
1. 68-70 AMX/Javelin Rallye Pac 2. 71-74 AMX/Javelin Rally Pac 3. All AMC's with gauge package, in center console, like Pacer, Hornet, Gremlin, Concord, etc. Neither will electrically interchange or read properly when swapped around, they all have the same 1/8" NPT thread. The first and third one look exactly the same, Stewart Warner Units with a square looking top. The second unit is domed on top.
|
|
Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
|
mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
Post Options
Thanks(0)
|
the car is a 74 amx but the dash came out of a different car. so not sure on that. it is the rally pac with the oil, fuel, temp and amps on the left, speedo in the center and tack and clock on the right.
|
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
Your gauges are for the 71 to 74 Javelin bodies.
What is explained is there are three oil pressure sending units. The domed top on the sending unit is what yours should look like. I have one that looks very close to the AMC unit, but its a MOPAR part. I may need to add a resistor the lead to make up for the impedance difference. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
Post Reply | Page <1234> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |