rvwp Posted December 1, 2019 Report Share Posted December 1, 2019 Hi guys, Just reinstalling the original oil filter on my rebuilt TR4a engine. The filter head is secures by 3 bolts, and a stud. The oil feed pipe which connects to the oil pressure gauge is connected to this stud with a domed nut. I'm probably just being dipsy, but I can't see any connection through this stud into the banjo. So how does the pipe see oil pressure? Rich Quote Link to post Share on other sites
RogerH Posted December 1, 2019 Report Share Posted December 1, 2019 Hi Rich, I'm sure the hole in the filter head where the stud goes in is either over size or it has a slot in it. be careful with the copper washers either side of the banjo - they are different sizes. Roger Quote Link to post Share on other sites
rvwp Posted December 1, 2019 Author Report Share Posted December 1, 2019 Hi Roger, Ah, that makes sense. I will have a closer look tomorrow and it will probably be clear and make sense, Thanks Rich Quote Link to post Share on other sites
peejay4A Posted December 1, 2019 Report Share Posted December 1, 2019 The hole in the housing is indeed oversized. As Roger says get the copper washers in the right order. Largest nearest the block, smallest under the domed nut. Anneal the washers before fitting and they’ll seal nicely. Quote Link to post Share on other sites
rvwp Posted December 2, 2019 Author Report Share Posted December 2, 2019 Well, the hole isn't particularly oversize, but there is a slot in the casting leading to the hole so I assume there must be enough clearance for oil pressure to get by. Although with the gasket in place there is not a lot of room. I guess I will see once the engine is run up. I guess the design must work ? Cheers Rich Quote Link to post Share on other sites
ianc Posted December 2, 2019 Report Share Posted December 2, 2019 With the oil pump giving a nominal 70 psi, a very small hole is more than adequate to make the gauge work! Ian Cornish Quote Link to post Share on other sites
stillp Posted December 2, 2019 Report Share Posted December 2, 2019 Remember it doesn't need any flow, it just needs to transmit the pressure. Pete Quote Link to post Share on other sites
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