edwardatherton Posted June 20, 2007 Share Posted June 20, 2007 Does anyone know what thread the oil pressure switch is please? It is part number PRC6387 and is a much finer thread than the earlier (but almost same-looking) switch for the 2.25 engine. Thanks in advance...! Quote Link to comment Share on other sites More sharing options...
mmgemini Posted June 20, 2007 Share Posted June 20, 2007 There is a switch for the 2.25 another for the 200Tdi and another for the 300Tdi. Then there's the V8......... I do know what thread the 300Tdi one is after a year of searching....... mike YES !! England is a free country. As long as you do as you are told. Quote Link to comment Share on other sites More sharing options...
edwardatherton Posted June 20, 2007 Author Share Posted June 20, 2007 Does anyone know what thread the oil pressure switch is please?It is part number PRC6387 and is a much finer thread than the earlier (but almost same-looking) switch for the 2.25 engine. Thanks in advance...! Paddocks list the same switch - PRC6387 - for the 300TDi as well. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted June 20, 2007 Share Posted June 20, 2007 In that case it's 10 x 1mm. Be very careful. I would not expect any other Land Rover engine to use that size thread in an oil pressure switch. Also there is one TPI between a 10 x 1mm and 1/8"BSP. Holding them together they look the same. mike YES !! England is a free country. As long as you do as you are told. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted June 20, 2007 Share Posted June 20, 2007 In that case it's 10 x 1mm.Be very careful. I would not expect any other Land Rover engine to use that size thread in an oil pressure switch. Also there is one TPI between a 10 x 1mm and 1/8"BSP. Holding them together they look the same. mike YES !! England is a free country. As long as you do as you are told. Dont forget 1/8"NPT that is almost the same as well. Quote Link to comment Share on other sites More sharing options...
western Posted June 20, 2007 Share Posted June 20, 2007 My EPC lists the oil pressure switch PRC6387 as a common part for the 2.25 petrol & all 2.5 engines petrol & diesel including both versions of the Tdi, also confirmed in my 110 1987 on paper parts book [LR genuine copy] Quote Link to comment Share on other sites More sharing options...
mmgemini Posted June 20, 2007 Share Posted June 20, 2007 Yes Phil but at least you can see the taper. Now Ralph that makes very interesting reading. Why would the original engine use metric ?? mike YES !! England is a free country. As long as you do as you are told. Quote Link to comment Share on other sites More sharing options...
western Posted June 20, 2007 Share Posted June 20, 2007 maybe it's not metric but unf & the later engines just use older parts, I know for certain the 200Tdi & older 2.5TD oil pressure switch & oil filter head are the same parts. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted June 20, 2007 Share Posted June 20, 2007 Well I took a new straight from the dealer oil pressure switch to my guy that seels me nuts and bolts. It would only fit the 10 x 1mm nut. Funny isn't it. Do you remember me looking for an adaptor to fit my oil pressure gauge ?? mike YES !!England is a free counmtry. As long as you do as you are told !!! Quote Link to comment Share on other sites More sharing options...
western Posted June 20, 2007 Share Posted June 20, 2007 Well I took a new straight from the dealer oil pressure switch to my guy that seels me nuts and bolts. It would only fit the 10 x 1mm nut.Funny isn't it. Do you remember me looking for an adaptor to fit my oil pressure gauge ?? mike YES !!England is a free counmtry. As long as you do as you are told !!! Well that's just wierd that it turns out to be a metric thread. Yes, I remember the adaptor, have you found one yet? can't remember if you have a capillary or electric driven gauge, my oil pressure gauge is the genuine LR elctric one & I used the adaptor in my modified drawing attached, was wondering if it would do for your gauge connection. oil_pressure_gauge__trnamitter_fittings.pdf Quote Link to comment Share on other sites More sharing options...
edwardatherton Posted June 21, 2007 Author Share Posted June 21, 2007 Well that's just wierd that it turns out to be a metric thread.Yes, I remember the adaptor, have you found one yet? can't remember if you have a capillary or electric driven gauge, my oil pressure gauge is the genuine LR elctric one & I used the adaptor in my modified drawing attached, was wondering if it would do for your gauge connection. I am fitting a capillary gauge. It is the genuine Land Rover dual gauge complete with all parts in an unopened box from 1964! I thought I had better use it rather than leave it on the shelf. However, the water temp transmitter thread wouldn't fit the 2.5 head or the two 2.25 heads I had in the garage. Engineering shop down the road sorted that out for me. The oil pressure bit comes with a banjo/extension as per Western's drawings, but the thread is the coarser type as used on the 2.25 oil pressure switch. I thought if I could find an adaptor to go between the block (10x1mm) and the 'extension' piece (3/8 BSF as per earlier oil pressure switches?) it would all then go together. How come some places sell the same switch for all 2.25/2.5 engines. It definitely is different! Not only the thread, but there is an 'extension' on the later 2.5 switch to clear the filter housing (see next sentence). By the way western, how did you go fitting the banjo bit? There is a sort of collar so the thread is slightly recessed on my block and it didn't look as if the fitting would screw in without tha banjo fouling the edge... Quote Link to comment Share on other sites More sharing options...
mmgemini Posted June 21, 2007 Share Posted June 21, 2007 Yes, I remember the adaptor, have you found one yet? Is that me your talking to Ralph. Yep I got the adaptor. Went to my normal place in Middlesbrought to find it closed. I had to go to Demon Tweeks. Twice as expensive so I bought a roll of Tank Tape as well. The adaptor was 10 x 1mm and 1/8NPT when I required 1/8BSP......How I wish they would go back to only Whitworth.... So armed with a 1/8BSP tap I managed the job. Oil pressure gauge works a treat..... It's the one on the right... mike YES !! England is a free country. As long as you do as you are told.... Quote Link to comment Share on other sites More sharing options...
western Posted June 21, 2007 Share Posted June 21, 2007 Sorry Mike, Yes the adaptor have you got one was for you, I see it's all sorted now. Edward ---- By the way western, how did you go fitting the banjo bit? There is a sort of collar so the thread is slightly recessed on my block and it didn't look as if the fitting would screw in without tha banjo fouling the edge... I used some copper crush washers between each part when they were fitted. some picures of mine fitted here these may help Quote Link to comment Share on other sites More sharing options...
nobber Posted August 11, 2007 Share Posted August 11, 2007 nice one , glad i found this. ive got the same banjo bolt and adaptor for my td but im trying to fit a 1974 rangie oil pressure sender into it. can anyone help me out as to what kind of adaptor i need? Quote Link to comment Share on other sites More sharing options...
western Posted August 11, 2007 Share Posted August 11, 2007 use the parts as shown on my modded diagram, there all the genuine parts for the TD engine doubt the RR sender will fit & work with the correct gauge for the TD engine. Quote Link to comment Share on other sites More sharing options...
nobber Posted August 11, 2007 Share Posted August 11, 2007 thats the thing you see ,both my guage and sender of from a 74 rrc v8. Quote Link to comment Share on other sites More sharing options...
western Posted August 11, 2007 Share Posted August 11, 2007 I reckon they won't give you the correct readings for the TD, I haven't got a parts book for 1974 RR so can't check part numbers. I'd put them on ebay & get the correct bits. then you'll know it's right & giving the right readings. Quote Link to comment Share on other sites More sharing options...
nobber Posted August 11, 2007 Share Posted August 11, 2007 it reads in psi so the correct sender that is calibrated to the guage will work no matter what vehicle its from , all i would then need to know is the engines normal running pressure. Quote Link to comment Share on other sites More sharing options...
western Posted August 11, 2007 Share Posted August 11, 2007 OK, TD oil press @ 2000rpm is 2.5 to 4.57 kgf/cm3 whatever that is in psi I no idea. Quote Link to comment Share on other sites More sharing options...
nobber Posted August 11, 2007 Share Posted August 11, 2007 nice one , thanks m8y. you dont happen to know the thread sizes on both sides of the reducer i need do you? Quote Link to comment Share on other sites More sharing options...
western Posted August 11, 2007 Share Posted August 11, 2007 Sorry, don't know what the thread details are, that was the main reason I went with the correct bits for my 200Tdi. Quote Link to comment Share on other sites More sharing options...
crusader Posted May 14, 2010 Share Posted May 14, 2010 I hate to drag an old thread back to life, but I'm trying to split the oil pressure port on my 2.5 NAD to run a mechanical pressure gauge while retaining the low pressure warning lamp. I've re-read the thread several times, but I can't figure out what the definitive thread pitch was on the PRC6387 sender. Is it 10x1 or 1/8 BSP or "other"? Just trying to order the right adapter here: http://www.holden.co.uk/displayproducts.asp?sg=2&pgCode=070&sgName=Hardware&pgName=Gauges&agCode=0611&agName=Smiths+Classic+Gauge+Fittings Thanks! Quote Link to comment Share on other sites More sharing options...
Dads Toy Posted May 14, 2010 Share Posted May 14, 2010 Well I'm glad it's not just me that's having trouble with this! I'm trying to replace the low pressure switch on my 300Tdi with a gauge sender that has a low pressure switch built in, but the body fouls before it seats fully. I just need a straight extender but rocking horse manure seems easier to find. I'm going with Westerns adaptor (PRC4033) but suspect the threaded section is going to be too long so will need to cut it down and a die run over the threads. Here comes the tricky bit - just like Crusader I'm still not sure what thread it is! 1/8 nptf, M10x1 ? Surely there must be a spec for the sender somewhere. Malcolm Quote Link to comment Share on other sites More sharing options...
western Posted May 14, 2010 Share Posted May 14, 2010 M10 x 1mm see post 9 ^^^^^ Quote Link to comment Share on other sites More sharing options...
crusader Posted May 14, 2010 Share Posted May 14, 2010 M10 x 1mm see post 9 ^^^^^ M10 x 1mm--Perfect, thanks! That's what the guy at my local auto parts store said too, but I wanted to get a 2nd opinion. (post 8^^^^^ seemed to question all the others) Quote Link to comment Share on other sites More sharing options...
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