Oil Pressure dropping Toyota 1HZ
Submitted: Monday, Mar 01, 2010 at 23:46
ThreadID:
76470
Views:
11670
Replies:
7
FollowUps:
8
This Thread has been Archived
Enormous Racing
G'day,
I have a 94 Troop Carrier with a 1HZ. Its has done 415,000k's. I have done about 40,000 in it. Recently the oil pressure gauge keeps going up and down, today it was hanging around the lower central mark on the gauge at 2500rpm's, at lower revs it would pick up. I regularly change the oil & filter, around every 5000, last 2 changes I've used Castrol 15W 40 diesel oil. The temperature is consistently in the middle, never moves. Does anyone have any ideas why the pressure may be dropping?
Reply By: Member - ross m (WA) - Tuesday, Mar 02, 2010 at 00:22
Tuesday, Mar 02, 2010 at 00:22
Yours sounds like a gauge or sender problem.
If the pressure goes sky high when cold and fades away to nothing when warmed,it maybe from worn main bearings
The best and only way is to beg,borrow or steal a mechanics pressure gauge and plug it into the hole where the sender is.
From memory ,the 1HZ should be able to hold 36 psi at 2500 rpms for 2 minutes when warmed up.
50 psi+ is more like normal
AnswerID:
406806
Follow Up By: furph - Tuesday, Mar 02, 2010 at 08:09
Tuesday, Mar 02, 2010 at 08:09
The book says more than 29kPa (4.5psi) idling, more than 245kPa (35psi) @ 3000rpm. Engine at operating temp.
The gauge does seem to vary somewhat, I just put it down to the mood its in.
Checked the actual pressure once (
mine) and it was idling at 12psi, 35psi @ 2000rpm.
furph
FollowupID:
676615