Zac7803 Posted December 21, 2020 Report Share Posted December 21, 2020 Anybody know what the right size wrench is to remove the oil pressure switch/gauge. Or have any tips/tricks for getting that sucker off in those tight quarters? I’ve removed the tire and oil filter, but still not a lot of room to work. 84 720 4x4. 1 Quote Link to comment
datzenmike Posted December 21, 2020 Report Share Posted December 21, 2020 It's up under the intake but you should be able to lean over the fender and feel a socket onto the sender and loosen. Just keep trying deep sockets till you get it. You didn't say but if you have a 4x4 then the sender is different and an open end wrench slipped in between the sender and the block is the only way to loosen it. Once loose you can spin it off but never try to wrist it off by hand. The senders are BSPT so non metric so I expect it is 9/16 or maybe 5/8". If I remember tomorrow I'll measure one. 1 Quote Link to comment
Zac7803 Posted December 21, 2020 Author Report Share Posted December 21, 2020 @datzenmike ah! Yeah its a 4x4. I was trying a 14mm last night, so I will try a 9/16 or 5/8 tonight. I have the new one coming today so I will know for sure either way. They sure didn't leave much room in there to get that off. Thanks for the help. Quote Link to comment
datzenmike Posted December 21, 2020 Report Share Posted December 21, 2020 If the spanner were slightly bent in a curve and/or thinner it would be better. Resist the temptation to grab and twist it, the casing will come loose. The 1/8 BSPT fittings are a hold over from the '50s when Nissan and Austin of Great Brittan formed partnership to build cars. Quote Link to comment
Zac7803 Posted December 21, 2020 Author Report Share Posted December 21, 2020 Yeah I definitely tried grabbing and twisting, it did nothing. When I get it off i don't envision having to change this again, but in the case that I do is there a mod to make it not such a pain? Quote Link to comment
datzenmike Posted December 21, 2020 Report Share Posted December 21, 2020 The case is crimped on and twisting it will loosen it. I think it's a non metric wrench so find one at a yard sale and grind it down and or bend it and keep it just for that. I made this specifically for carburetor nuts. 1 Quote Link to comment
Zac7803 Posted December 22, 2020 Author Report Share Posted December 22, 2020 Thanks again @datzenmike. It definitely was a 9/16. No that bad too get off when you have the right tools! 1 Quote Link to comment
Zac7803 Posted December 24, 2020 Author Report Share Posted December 24, 2020 @datzenmike so I got the switch replaced. While switching it out I dropped a wrench on the starter solenoid and it sparked, now the truck will not turn over. It’s like it blew a fuse but all fuses appear good. I took the starter off and had it tested at NAPA, they said it good. Any suggestions Quote Link to comment
Lockleaf Posted December 25, 2020 Report Share Posted December 25, 2020 Look at the fusible links. Those are the lengths of various wires like 3 inches long that go between the battery and the 3 connectors right close to the battery. Quote Link to comment
datzenmike Posted December 25, 2020 Report Share Posted December 25, 2020 Turn your ignition switch to on. Now turn on the wipers or radio. If they come on the first (green) fusible link is fine. Do the headlights come on? That's the second (green) fusible link. Honk the horn If it works the single (black) fusible link is fine. If the wipers, headlights and horn work then the fusible links are good. 1 Quote Link to comment
Zac7803 Posted December 27, 2020 Author Report Share Posted December 27, 2020 All three work(lights,wipers,horn). I got it running x mas eve. The solenoid connecter was off, put it back on it fired right up. Tried it yesterday and same issue. Messed around with the connector and haven’t been able to get it going again.So I’m thinking that connector is bad? Quote Link to comment
datzenmike Posted December 27, 2020 Report Share Posted December 27, 2020 Make sure the brass connector is secure on the wire. What I do is gently squeeze it so it fit's on the solenoid terminal tighter. Quote Link to comment
Zac7803 Posted December 28, 2020 Author Report Share Posted December 28, 2020 Alright tried that, still nothing. I cut the connector plug and just put a regular connector on, still nothing. Before it started running again my brother in law jumped it using a wire, then it started shortly after that. I tried doing the same thing, but couldn't get anything out of the starter Could the starter have a bad spot in it? Quote Link to comment
datzenmike Posted December 28, 2020 Report Share Posted December 28, 2020 On both my Datsun cars the start signal from the ignition was week, like 8 volts. Probably old thin wire and the long distance from battery to ignition and back out to the starter. Borrow a volt meter and measure the start signal with the black start wire off. If the start signal is week the solenoid wont click. Quote Link to comment
Zac7803 Posted December 28, 2020 Author Report Share Posted December 28, 2020 Ok so its a black wire that goes from the battery to the ignition and then back to the starter? Is this the same wire I'm having issues with the connector on the solenoid? Quote Link to comment
datzenmike Posted December 28, 2020 Report Share Posted December 28, 2020 3 hours ago, datzenmike said: On both my Datsun cars the start signal from the ignition was week, like 8 volts. Probably old thin wire and the long distance from battery to ignition and back out to the starter. Borrow a volt meter and measure the start signal with the black start wire off. If the start signal is week the solenoid wont click. The black wire sends the start signal from the ignition switch to the starter solenoid. Should be around 12 volts or so. 1 Quote Link to comment
MaddieCycle Posted January 9, 2021 Report Share Posted January 9, 2021 Does anyone have a picture of exactly where the sensor is on a 4x4? I can't even figure out where it is much less what tool to make to reach in there. It is aft of the oil filter? Does the filter have to come out to replace the sensor? My idiot light does not light at all and pressure gauge is erratic, figure I need to change the sensor. 1 Quote Link to comment
Zac7803 Posted January 10, 2021 Author Report Share Posted January 10, 2021 @MaddieCycleI don’t have a picture, but I just replaced mine. It’s directly to the left of the oil filter. It’s a 9/16, it’s easiest if you have the filter out , dust shroud removed and tire off. Not a lot of room to work with so the smaller the wrench the better. 2 Quote Link to comment
datzenmike Posted January 10, 2021 Report Share Posted January 10, 2021 I think it's a 9/16" (that's INCH) open end spanner. It's up under the intake, between the starter and the oil filter This is not a Z series engine so ignore the head that is on it as the blocks are the same for what we want. The oil filter is off but if you look to the left about half way to the dip stick, that little round thing with the terminal sticking out is a 2wd oil sender for just the red warning light. The 4x4 is larger and has two wires with one for the gauge. The twin wires will have a rubber dust boot that pushes over the end where my thumb is. 2 1 Quote Link to comment
MaddieCycle Posted June 27, 2021 Report Share Posted June 27, 2021 (edited) I just did this. The stubby wrench in Datzenmike's pic is what you want, otherwise it is an annoying pain. It is an annoying pain anyway, but with the oil filter out and wheel and wheel well liner out, it only takes a few minutes. My rubber boot is nonexistant, maybe I will fashion one up at a later time. And yes, 9/16" wrench. Edited June 27, 2021 by MaddieCycle 1 Quote Link to comment
Charlie69 Posted June 27, 2021 Report Share Posted June 27, 2021 On 1/9/2021 at 10:29 PM, datzenmike said: I think it's a 9/16" (that's INCH) open end spanner. It's up under the intake, between the starter and the oil filter This is not a Z series engine so ignore the head that is on it as the blocks are the same for what we want. The oil filter is off but if you look to the left about half way to the dip stick, that little round thing with the terminal sticking out is a 2wd oil sender for just the red warning light. The 4x4 is larger and has two wires with one for the gauge. The twin wires will have a rubber dust boot that pushes over the end where my thumb is. The large 2 wire oil pressure sender is used on the 2 wheel drive ST trucks that have the oil pressure gauge also. Quote Link to comment
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