Low oil preasure
 

My oil pressure has been gradually going down. It idles just above the red and sits at about a little more than 15 most of the time but doesn't go much higher. Once I get past 1500 rpms the engine starts ticking. Any help is appreciated, really not wanting to have to dump money into rebuilding a 305.

Update: The oil pressure is at almost 30 when i start it up and the ticking was gone, but then gradually over like 10-15 minutes of driving drops to about 15 and the ticking came back. Higher rpms seem like they dont change it much at all.

Re: Low oil preasure
 

Does not sound good, what is the ticking noise? Lifters or a rod knock? Either way I suspect you will need a rebuild.

Re: Low oil preasure
 

Last oil change? Oil full? what brand of oil filter?

Re: Low oil preasure
 

Try some 20w50 if its wore out this heavy oil may quiet it down some but you probably looking to rebuild or replace soon im afraid.

Re: Low oil preasure
 

Add a bottle of STP oil treatment - http://www.walmart.com/ip/STP-Oil-Tr...-15oz/16817398

Adds extra zddp needed for pre '87 flat tappet cams. Fingers Crossed.. and a Pray..

Re: Low oil preasure
 

Not sure what the ticking is. It's not loud or harsh, but just quietly there. And about the oil change that's the first thing I need to do, as I just bough the car about a month ago and haven't got it changed and Idk when they last did it. Really hoping I can fix it with some better oil or a new filter. If I do need a rebuild, how much does that usually cost? Any ideas?
Now that I think about it probably lifters causing the ticking.

Re: Low oil preasure
 

I had a low-oil pressure issue on my engine where three of the four oil pump bolts had worked their way out. Perhaps not the source of your problem, but something to consider.

Re: Low oil preasure
 

Pressure is a resistance to flow. When the engine is cold, flow is reduced and you see pressure. As the oil gets hot, viscosity drops and anywhere it can leak out will be easier. The chances of the oil pump being bad is very slim. That means you'll probably need engine work. The ticking is probably a lack of oil to the lifters and rockers.

Main bearings worn will cause an oil leak but will not cause noise until a bearing seizes onto the crankshaft.

Rod bearings wearing will generally cause a noise when they start to fail but will also make noise hot and cold.

Camshaft bearings can spin in the block and will wear causing a hot oil leak that won't show when the oil is cold. They will also not create a noise.

Buy a new oil filter to replace the one on the car. Don't worry about an oil change yet. Take the old filter and cut it open any way you can. Even a hacksaw can be used. Just cut the top off. Pull out the filter material and rip a chunk of it out. Squeeze that piece in a vise to get all the oil out of it then open it up to look inside. If there's lots of metal in the material, you have bearings going. All the temporary help such as thicker oil won't fix an engine in need of a rebuild.

Re: Low oil preasure
 

"All the temporary help such as thicker oil won't fix an engine in need of a rebuild."

There isn't much in a can that is a long term fix for low oil pressure or a tick..

Re: Low oil preasure
 

Thanks for the help. I'll try looking for metal chips in the oil. If I do need a rebuild, does anyone have a ballpark figure of what that will cost?

Re: Low oil preasure
 

More than a 305 is worth.

IOW, if you get to that point, DON'T do it to your existing block. Put a "bore kit" in it. And a good set of heads. Those crappy "swirlies" aren't worth the time of day either, any more than a 305 is.

Re: Low oil preasure
 

More than the cost to buy a stock replacement engine.

Re: Low oil preasure
 

Thats what i thought. if I need a rebuild, then I'm just gonna run it till its dead while i save and then swap a 350 into it. How hard is it to find a good running junkyard 350 anymore? Or is there a better place to get one?

Re: Low oil preasure
 

96-2000 ones (aka Vortec) are pretty plentiful and not too $$$.

Re: Low oil preasure
 

Augh well I guess I'm engine swapping this summer. Here's another question, what can I do to make this motor last as long as possible? Would thicker oil and an oil additive help? And how long do you think it'll last?

Re: Low oil preasure
 

[QUOTE=Mattkovitch;6009672]...Would thicker oil and an oil additive help? ...QUOTE]
No and No.

Re: Low oil preasure
 

:thanks:

Re: Low oil preasure
 

Any ideas on how to make the engine last as long as possible, while I get some money together for a 350 swap

Re: Low oil preasure
 

Don't let it lug at low rpm. Raise the idle speed. Don't rev it over 3000.

Re: Low oil preasure
 

Could also be an exhaust leak, injector click noise, bad oil pressure switch making the gauge read off.. So hard to tell thru internet posts,, Make a vid so these guys can hear it for a better diagnosis..

Re: Low oil preasure
 

I was hoping you're right, but I don't see it being probable as the ticking sound development right after the Gage started reading low oil pressures.

Re: Low oil preasure
 

Does it have the proper oil level? It was asked earlier in the thread but I didn't see an answer.