301 crankshaft bearing clearance

I googled this subject and did not come up with much info  pertaining to orange,  so I'll start a thread. 

Edited by Beirnesy - 07 Mar 2019 at 9:36pm

There is some good videos from Mahle on youtube,  about this subject but  not directly  related  to sled pullers. 

Edited by Beirnesy - 05 Mar 2019 at 6:29pm

That will work fine. Use 15W-40 motor oil and nothing any thicker.

If you are using a D-2900 block and you have decided to remove the engine oil cooler and its large external oil lines, you MUST also remove the spring and plunger from the rear oil crossover passage in the block. You will have near ZERO oil pressure if you don't remove those parts and ruin your new engine.

Looser clearances free up power, but don't go too far. Ive read for every inch of journal use at least .001 clearance , you are good.

On a D-2800 (non-turbo) engine, oil flow from the engine oil filter goes thru passages inside the block to get the oil from the left side of the block to the right side main oil galley. The passage in question is the rear crossover passage connecting the filter to the right side of the block. On a D-2900 (turbo with oil cooler) they have inserted a plunger and spring inside this rear crossover passage to BLOCK oil flow thru the block and force the oil out thru an elbow at the left rear corner behind the oil filter and then thru external steel tubing around the block to the oil cooler on the right side of the engine. After oil goes thru the cooler it then enters the main oil galley providing oil to the engine bearings. Removal of the oil cooler and external lines WITHOUT removing the plunger and spring inside the block results in catastrophic engine failure !!!  Also, removing the oil cooler requires changing the water pump volute to provide proper water flow thru the front of the engine block.

I should explain, when I removed the cooler, I ran a pressure hose from from brass 90, directly to other side of block.

You noticed my mention of a different water pump volute too.....??

The water pump attaches to the volute. The volute bolts to the engine block. If you have removed the engine oil cooler and are still using the old volute, I think your coolant flow into the engine block is very low because the volute doesn't have a large hole in it to match the hole in the engine block. Get a volute from a non-turbo engine or open up the small hole to increase coolant flow.