ms85er

I had checked on old toyomods threads before I fitted it and there should be no problems with pressure with the 4m pump, I'm not sure about vane size, I don't have a great deal of knowledge about the oil pumps and pressure relief valves so that's why I just fitted a brand new pump correctly (or so I thought). I'm starting to think there is a leak from the pickup tube maybe. I guess the sumps coming off. If I can't find the culprit maybe I'll fit a 7mge or 7mgte mid sump pump from a mk3 supra and shim it with 7mm worth of washers for more pressure.

hhhmmmm the plot thickens.... or thins :P I'll have a thorough look for leaks tomorrow but the sump and block seems to be holding pretty well from what I've seen so far. I'm thinking of trying some Shell Helix HX7 High Mileage 15W-50 tomorrow and seeing what pressure I get.

Yah I was thinking that maybe the bottom end is worn, the head has been reconditioned. It was hard to look at the bearings with the borroscope and a light through the sump plug hole it's still real dark in there, I'll try again later. So if the engine were mega worn would the oil pressure still be reasonable cold? Cos the pressure is great at idle from cold to 30 degrees coolant temp then the closer it gets to operating temp it's goes rapidly low.

Hi all, I'm bit of a foreigner here as I don't own any corolla but I have a 1978 ms85 Toyota crown that I just put a 5mge in to. Everything has been working great since I put the 5mge in until I hooked up the oil pressure light and a gauge. The car has a Brand New (old stock) Aisin 4m oil pump (to suit my old 4m mid sump) which I installed to the 5mge and a large capacity K&N oil filter. I put 10w30 oil in it, I would start the car and it would be about 25psi at idle, then as the temperature of the car increases it would drop slowly down, then at about operating temp it drops down to 3-5 psi and after a while of driving the oil pressure light comes on. I then proceeded to install a mechanical oil pressure gauge as I just thought the sender was stuffed, turns out the readings are correct....CRAP. I fortunately was able to borrow a Olympus borroscope from work so I drained the oil, chucked the borroscope up into the sump and had a look around, looks great, perfect nothing stuck in the pickup. I also had a look at the oil, perfect!. So I have now changed the oil filter to a genuine Toyota filter and upgraded the oil to 15w40. Started great was 60 psi cold in the morning (11 degrees here) and then as it warmed up it did the exact same thing dropped really low, then at operating temp it was slightly better but was dropping down to about 5 psi at idle and then the oil pressure light started to come on. Now its getting real bad, there are brief moments where the idle rapidly increases and it is temporary starved of oil for a about 1.5 seconds so I shut it off immediately BUT its only when warmed up, never when its cold, runs great cold. sump has 5.6 litres of oil in it as stated by an old crown brochure the 4m mid sump is 5.6 litres. I am prepared to drop the sump if I have to but it makes no sense. Any help is greatly appreciated.

yah I havn't seen many old crowns with no rust, and the ones I have seen people want way too much for them. good stuff i'm keen to see more pics

Hay mate, just joined to converse with a fellow barge driver haha. I just got a 5mge with a rebuilt head into my ms85 and getting her ready for rego, your project looks sweet, you got a very good condition car there, mine was an ex- farmer's family car so its fulla rust and mud. I'm impressed with some of the ideas you have, different steering racks etc,