Hi, I am having a oil problem to the top end of my 632 BBC, dart block (10.2). The machine shop put restrictors in. With or without the the oil coming up the pushrods is minimal. With about 3 minutes of run time I get barely any oil in the heads. The amount of oil is not enough to puddle enough to go to the drain backs.

This engine was refreshed and worked fine. It had .842 lifters but the engine had a lifter failure that required the block to be machined for .904 lifters. The cam is reused crane. When priming with the prime tool I see oil running on to all 16 rollers. Crane told me I have the correct rollers lifters for the dart block. With the primer rod I have 70 psi oil pressure but continued priming and rotating the engine produces no significant oil onto the rockers. All pushrod hole and rocker holes are clear.

Anybody ever have this type of issue? Ideas as to what is wrong?

Thanks in advance,

Bob

Take the lifters out, take a electric pencil and etch a small line from the slot in the lifter to the feed hole.

do you how small the restrictor hole is ,i think i had to take mine to .100 or a little larger

We have contradicting statements. The title says no oil and then the intro post says no significant amount of oil.

If you have oil but just not as much as you'd expect to see, pour oil over the rockers and fire it to verify.

Or we can make 100 posts discussing drill specifications and priming tool configuration.

Take out the restrictors. Pretty much all roller lifters are already oil restricted by design...you don't need them.....

Same block, same size lifters, no restrictors, no oiling issues.

I may have confused the issue.

The machine shop put restrictors in. When I primed it I had no oil at all seen in the rockers. I removed the restrictors and now I still see no oil while priming.

When I fire the engine and run it with the valve covers on I see a very small amount of oil in the heads when I remove the valve covers after about 3 to 4 minutes of running at 1200 RPM. I have not run it with the valve covers off.

I am concerned that there is not enough oil upstairs but I am no expert. The original engine flooded the top end hence the machinist desire to restrict the oil to the lifters. I removed that restrictor when I got no significant oil to the rockers.

Now with or without the restrictors there is no visible oil to the rockers. Crane said I have the correct lifters for the dart block. I would think there is a lifter mismatch.

I am searching to see if this issue has come up before and what I need to do. The machine shop is saying they did nothing wrong and that I ordered the wrong lifters. Crane said they are the correct lifters.

Bob

Have you confirmed you ordered the right lifters You obviously are getting oil to the pushrods. I say run the engine above 2000RPM up to normal operating temp, shut it down then pull the valve covers.

That said, why did you choose crane lifters?

after reading new info the groove should help.another choice of lifters should also help

Different subject but a friend installed Crane 904 lifters in his Hemi and had one fail after 6 runs, destroyed his camshaft. After doing some investigating apparently Cranes lifter quality has gone in the tank after being bought out. He is switching to Morels, he originally bought based on price and it cost him. I personally have had nothing but good luck with Isky, both needle bearing and EZ roll bushed .904 lifters

Spoke with dart and dart did the machine work for the lifter bores. Dart said they machined with .0015 clearance per crane’s specification. They think the .0015 may be a little tight and restricting oil to the oil hole in the lifter. They discussed the groove in the lifter.

I am now calling the machine shop to verify they checked the lifter clearance at .0015 and discuss the feed groove.

Bob

Bob

quote:

Originally posted by SX 66:
Spoke with dart and dart did the machine work for the lifter bores. Dart said they machined with .0015 clearance per crane’s specification. They think the .0015 may be a little tight and restricting oil to the oil hole in the lifter. They discussed the groove in the lifter.

I am now calling the machine shop to verify they checked the lifter clearance at .0015 and discuss the feed groove.

Bob

Bob

Lifter bore clearance has no effect on oil feed to the lifter...the oil band position on the lifter does. If the engine was apart you could leave the galley plugs out, put the cam in and a set of lifters and look down the galley to see if the oil band is intersecting the galley. Rotate the cam and check at all points of lift....

I'm gonna go out on a limb and say the oil band on your lifters isn't intersecting the galley, and that's the issue. More lifter bore clearance will not fix that, you need different lifters....

Compare the location of the oil band on one of your old . 842 lifters to one of your new lifters.
I'll bet that will show you what the problem is

Also you said when priming it you see oil running on all of the rollers that tells me the oil band is too low letting the oil escape out the bottom of the lifter bore

quote:

Originally posted by Coloradoracer:

Lifter bore clearance has no effect on oil feed to the lifter...

Unless it's too large. LOL

quote:

Originally posted by "The Bender":
Compare the location of the oil band on one of your old . 842 lifters to one of your new lifters.
I'll bet that will show you what the problem is

This is likely the problem! Also are the lifter bore bushed? I have seen this issue due to the bushing, the oil feed hole is small and may only overlap with the lifter oil feed for s very short period if at all. Go on Dart's web site and when you get to the Big M block, click on Tech Sheet, scroll down and you will see the slot machined on the lifter from the oil feed hole that supplies oil to the pushrods, to the oil band in the lifter body! Some lifter need this, some don't and as I mentioned, if the bores have been sleeved, that can also effect this.

quote:

Originally posted by SX 66:
Spoke with dart and dart did the machine work for the lifter bores. Dart said they machined with .0015 clearance per crane’s specification. They think the .0015 may be a little tight and restricting oil to the oil hole in the lifter. They discussed the groove in the lifter.

I am now calling the machine shop to verify they checked the lifter clearance at .0015 and discuss the feed groove.

Bob


Bob

I don't think this is the problem! Betting it's the location of the lifter oil band vs the block feed oil location. Note all lifter oil bands are not in the same location and also note that the cam also plays a role here as it locates the lifter in the bore!!!!

quote:

Originally posted by CURTIS REED:
Unless it's too large. LOL

I may be way off base with this. But if you have shaft rockers, dont the adjusters have to be in a certain spec range or you close off the oiling holes to the rockers??

quote:

Originally posted by Buck2248:
I may be way off base with this. But if you have shaft rockers, dont the adjusters have to be in a certain spec range or you close off the oiling holes to the rockers??

Yes they do, usually 1 to two turns out.