BC

I don't think that crank was drilled with knowledge of where the original oil feeds actually are. But this is all speculation until some sort of flexible tube is pushed in and observed somehwere else at exit.

John Veninger

A bad crank with an extra oil hole on the journal being feed the same old way.

atb

No need to sugar coat it for me John.

Go ahead, just give it to me straight.

drnick

i didnt realise the earlier cranks (4.7 etc) were different and not interchangeable??

Jim bailey - 928 International

As I recall, The crankshaft thrust bearing surface was changed in 1984 engine # 81E00148 5spd / 81E05343 At .

Mark Anderson

[QUOTE=atb]Stan wrote:
Basically, it looks like Taylor cross drilled the #2 main, and then drilled oil ports on both 2 and 6 rod at the off angle? QUOTE]

Did Taylor drill this crank?

Stan.Shaw@Excell.Net

Hi Brenda,

I wasn't able to figure out using a long zip tie. Perhaps fluid will work...

Hi Mark,

Sorry, I don't know who drilled the crank. As you know I wasn't able to get one from you at the time, so this wasn't purchased from you. P.S. got any lying around now?

Mark Anderson

I usually just have people deal direct with Taylor.

John Veninger

I do, but it comes with the rest of the motor

Vilhuer

Bearing side surface was made taller but does this prevent older style crank being used in later block? I think not. Around same time inside crank oil channel diameter was increased 1mm.

If all those extra holes go to closest mains bearing including #3 main (hard to say if there is hole on #3) and stock conrod feeds are blocked for these same rods the drillings sort of make sense. This would give each conrod it's own direct feed which are connected to each other only on mains area and not elsewhere like on stock crank.

John Veninger

Earlier in the thread.

928SS

bummer!!!

hate to further confuse the issues, but IIRC I've heard of some cranks that were drilled all the way through and not plugged on one end - which resulted in oil starvation at mid/high rpm's, because the oil was forced out the "extra" hole instead of going where it was supposed to....

ck w/greg brown at precision - I think that's where I heard about it...

Ian928

So are you saying an old crank can be used in a new block, but not vice-versa? This could be good news for me so please confirm if you can! According to wisdom, they are not interchangeable.

Vilhuer

I don't see any reason why both old-new and new-old block-crank combinations would not work. If only difference is tallness of #3 main bearing sides it should be fairly easy for machine shop to make sure taller bearing will fit on early style block. On later block installing lower old style bearing would be straight job. Bearing has to be selected based on crank. If on other hand width of bearings is different it is still probably possible to modify block to accept which ever crank is on hand. I know one local attemp to mix them but don't know how it ended. Machine shop doing it didn't see any problems but they hadn't done it yet when I last checked. Can't remember if it was old new or new-old they were working on.

Stan.Shaw@Excell.Net

Thanks Kevin,

I think you are right, since drilling is @$500, as I recall, and I should have a good crank in another shortblock I have. Saving it might not be cost effective, particularly since the drilling on this crank is suspect.