<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">The change in oil pressure is normal. <div>1. As others have noted, oil thins as it warms, thus the friction resistance is reduced;</div><div>2. The oil pressure relief valve is additive to the friction pressure. If you increase the spring pressure in the valve, pressure will increase both at cold start and during warm running conditions;</div><div>3. The pressure crated by the oil pressure relief valve can be increased either by replacing the spring or by shimming under the spring. You can experiment with different shim thickness - a flat washer will fit under the spring;</div><div>4 as the engine internals wear and tolerances increase, oil pressure falls. In a well used engine multi-grade oil is appropriate 30W50 for example.</div><div>5 as long as you are reading 10 pounds per 1000 rpm, you are safe.</div><div>6 If you shim too much so that the relief valve becomes inoperative, you can blow the filter off……</div><div><div dir="ltr">Best regards,<div>Jim</div></div><div dir="ltr"><br><blockquote type="cite">On Jul 21, 2025, at 4:14 PM, Alan Seigrist <healey.nut@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">As long as you are around 20 psi it should be okay, but you may want to consider replacing the oil pressure spring. It's a pretty easy replacement and you can do it in about 5 minutes.<br><br>what oil are you running? You should be running 20W-50.<div><br></div><div>Alan</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Jul 21, 2025 at 2:33 PM carl and gerry rubino via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-7061277751002736412">
<div>COLD START 60 LBS. DRIVEE ACROSS TOWN 50, ON HIGHWAY 60, BACK IN TOWN DROPS TO 20 IN 3RD GEAAR, 30 IN SECOND GEAR,<div><br></div><div>IS THIS S A PROOBLEM?</div><div><br></div><div>NO OIL LEAKS ANYWHERE-DIPO STITICK SAYS "ok"</div><div><br></div><div>1957 BN-4</div></div>_______________________________________________<br>
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