Recent content by Danfield

How long should it take to pump up a fully bled down lifter?

Yeah I am too hahaha. But the test I did gives me more confidence because they held pressure over night. They should still pump up reasonably fast if they bleed down anyway I would think. Unless they are bleeding as fast as they are filling. Not sure how they would ever hold pressure at all if...

Yeah, it's just a cheapo one though. According to the gauge it's got plenty and is also steady and consistent. So I had ruled out the pump for that reason but I don't know now what else it could be. The lifters do fill up, just not enough to stay nice and firm it seems.

I pulled out the current noisy/soft lifters and manually filled them with oil by hand so they were stiff. Put them back in, turned it over a few times and then ran it. They stayed stiff and were all quiet. Left it over night. Checked it in the morning. Still stiff. Came back an hour later...

Yeah, it would suck if it was the lifters, seeing as I replaced them to fix the issue. It seems unlikely but I guess it's possible. It's very likely they are Chinese.

Yeah they looked fine, easy to remove and the new ones slid straight in. Moved them up and down by hand and they felt good. No binding or anything. Thanks.

OK thanks, yeah I didn't think 1/8 would make any difference.

Just checking the preload again. Seems that some are about 7/8 of a turn past zero lash. Would this extra 1/8 of a turn past the maximum 3/4 be the issue? I could try shimming the bridges?

Oh, of course. I didn't think to check it that way on non adjustbles. Cheers, I'll check it out.

Not sure how to do that, in my mind any preload should be fine on a hydraulic as long as it's not bottomed out. That's what I don't understand about the method.

Some people suggest shaving down the rocker arm bridges as a cheap fix for this. Im wondering if this would make any sense if the lifters already have preload? Or will I just be giving them more preload? Is the idea that less travel would make it easier for them to pump up?

Nah I got a replacement set.

It does it cold and warm. Comes and goes how bad it gets. Sometimes it's not too bad but never fully goes away like it used to.

I'm not convinced my pump is bad but could it be possible that even though it has enough pressure, it might need more flow? Old motor, bigger clearances, has pressure but just needs more flow? hi flow pump? Just a theory.

I think my only options left are either a new pump, or try shaving down the rocker arm bridges a little. Or just, see how she goes.. haha.