WD45 oil pressure

[Lavoy]

I put an engine in a guys WD45 for him. Engine is freshly rebuilt, machine shop done, not a hone and ring job. With 30wt oil, new oil pressure gauge, it shows middle or better of the guage when just started. After half an hour on the dyno, I noticed the oil pressure gauge was at the bottom of the normal range. I pulled the gauge and put a master gauge in, 10PSI, engine 180 degrees, on the dyno at 540RPM PTO. I don't have any specs on the WD45, what is normal oil pressure on them. This seems low to me, and more alarming the difference cold to hot.
Thanks,
Lavoy

 

[Jerry Coulter]

Did you put in new camshaft bushings? That is a key item in a W engine rebuild.

 

[bjb in TX from Ne]

Are you using the right oil filter. Not sure about WD45, but on the WC and B it is a major issue as well. Search the old forums for lots of info.

 

[Brian G. NY]

The WD-45 service manual states that normal oil pressure is 12 PSI.

 

[Lavoy]

Not sure, I will check.
Thanks,
Lavoy

 

[Lavoy]

Engine is completely rebuilt from top to bottom.
Lavoy

 

[Lavoy]

According to the Hastings filters book, and my local AGCO dealer, the same part number is listed for B, C, CA, WC, WD, and WD45, did I miss something?
Thanks,
Lavoy

 

[BushogPapa]

Yes, wrong oil filter on these and you could have NO oil pressure...

Ron..

 

[Tramway Guy]

Also make sure that the 1/4" diameter tube that is pressed into the base is there, it goes up into the filter. Sometimes it comes off with the filter and gets discarded. If it is not there, it will definitely cause low oil pressure.

 

[Lavoy]

Yep, checked that first.
Lavoy

 

[David Grubb]

You can shim the oil pressure relief valve spring with some washers.