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| Oil Pump Squirting like a Fireman's hose https://slantsix.org/forum/viewtopic.php?t=36186 |
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| Author: | 60 Plymouth [ Wed Jul 08, 2009 11:10 am ] |
| Post subject: | Oil Pump Squirting like a Fireman's hose |
Hi Guys, On shut down only, the oil pressure sender squirts oil like no tomorrow all over the block and any unsuspecting fool under the car looking for what he thinks might be a slow drip. Does the sender have a gasket where it is screwed into the back of the pump? I ask because I can make gaskets here rather than wait for one to be sent. Also, why does it wait till the engine is off before going incontinent? Lastly, I read elsewhere that some special socket is needed to fit the sensor. Is this true? Beginning to get just a little tired with this old car, never felt like that about her before. Thanks guys, 60 Ply |
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| Author: | SlantSixDan [ Wed Jul 08, 2009 3:25 pm ] |
| Post subject: | Re: Oil Pump Squirting like a Fireman's hose |
Interesting. Only ever seen that once before, on a '62 Valiant I started up in a wrecking yard to see if its engine was any good. There's no gasket; the sender has pipe (tapered) self-sealing thread. If it leaks, it's because the internal diaphragm has got a hole. I'm not altogether sure, but the only way I can think of for this bizarre "leaks only on shutdown" behaviour to occur is that the diaphragm is ruptured in such a way that when it is under pressure (engine running) the hole is effectively sealed. Shut down the engine, this releases oil pressure from the diaphragm, the hole is opened up, and there's your leak. Replacing the sender will fix the problem. The socket is unique; it's an oil pressure switch socket. Very common in auto parts stores over here, but you might run into some difficulty over there finding one that's anything other than Metric. Check (again) with American Auto Barn. Vise-grips will get the job done. It'll be a little clumsy and slow, but it'll work. Quote: Beginning to get just a little tired with this old car
Old cars are like that. Some days you want to run 'em into the river and walk away without looking back, but then there are the countervailing days when they're running perfectly and you get lots of smiles and thumbs-ups from appreciative passersby.
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| Author: | 60 Plymouth [ Wed Jul 08, 2009 3:34 pm ] |
| Post subject: | |
Thanks Dan, much appreciated. Is the sender unit common to other engines? Being such a small silly part it seems a little strange Chrysler would change/modify its spec for any reason other than added complication. But then again, there are some weird sized master cylinder fittings around . . . |
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| Author: | Greg Ondayko [ Wed Jul 08, 2009 5:03 pm ] |
| Post subject: | |
The Slant six Sender unit has a different thread size when compared to other chrysler engines of the era. Get the right part. www.rockauto.com Greg |
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| Author: | SlantSixDan [ Wed Jul 08, 2009 7:51 pm ] |
| Post subject: | |
Quote: The Slant six Sender unit has a different thread size when compared to other chrysler engines of the era.
Year-by-year. There are two sender thread sizes and two different terminal connector types. Threads are 1/8"-27 NPT and 3/8"-18 NPT. The smaller sizes can be used (and often were, from the factory) with adaptor bushings into the larger thread of the oil pump housing. The '60 engines (slant-6 and V8 alike) came with the 1/8"-27 sender, Standard/BlueStreak #PS-11. On the slant-6 this was threaded into an adaptor with 1/8"-27 inner threads and 3/8"-18 outer threads. I don't like this arrangement; it means extra junctions for leaks. On my '62, I removed the small-thread sender and adaptor bushing, and just directly threaded in a Standard #PS-16, which has the larger 3/8"-18 threads. Same slide-on terminal.
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