Revised "rebuild or not"

m3810 · Post by **m3810** » Sun Nov 18, 2007 9:08 pm

I have the motor pretty much apart and it appears to me that it has recently been rebuilt as the head and cam, and oil pan gaskets look new.
However I found a surprise in the oil pan (see picture). It is from the shaft that drives the oil pump. My first question is why would it shear off or break and what is it for. Balancer, stabilizer? Also could this be the reason I cannot get the damn thing to run properly and lastly where do I find this part. I have looked at IAP and rock auto but don't honestly know what to call it.

Thanks Mark
[/img]http://img256.imageshack.us/img256/4836/part1lg6.jpg

So Cal Mark · Post by **So Cal Mark** » Sun Nov 18, 2007 9:40 pm

if the aux shaft is broken, the likely scenario is that it was out of time and the crankshaft counterweight hit it. This can often result in a huge hole in the block, so you're quite fortunate if only the shaft broke. Many people cut the shaft off and plug the end if they're using FI since the end of the shaft is only for the fuel pump lobe.

fiatS2000 · Post by **fiatS2000** » Sun Nov 18, 2007 10:10 pm

I had the exact same thing happen to one of my spiders.

m3810 · Post by **m3810** » Mon Nov 19, 2007 6:04 am

Mark,

I am confused by your reply. On non fuel injected cars is the fuel pump within the block? I do not see where it would mount externaly to be driven by the shaft or how the counter weight can hit. What am I plugging? Just to clarify, the shaft that I am talking about has gears on it which drives the oil pump. Sorry to be dumb on this one but I am just not that versed on fiat engines.

thanks again

So Cal Mark · Post by **So Cal Mark** » Mon Nov 19, 2007 10:50 am

FI cars use an electric pump mounted under the car, in front of the axle. A mechanical pump couldn't generate enough pressure for FI to work.
Once the lobe is cut off the aux shaft, oil pressure would be lost as oil would run out of the cut-off end. So, it has to be threaded and plugged

m3810 · Post by **m3810** » Tue Nov 20, 2007 10:52 am

[/img][URL=http://img442.imageshack.us/my.php ... .jpg[/img]

Mark,

I am going to drive you nuts on this one but I am not understanding (a) what and or why to plug the end of the shaft. In removing the oil pump I don't see how the shaft can affect oil pres. I am not by any means trying to second guess you I am trying to learn and understand so please do not take offense to my questions. Above is a link to a second picture of what I am talking about. I do not see on my previous post that the first one showed up so if you feel so inclined both are hosted at imageshack.com and my login info follows. username: m3810 password: Ls2ijPs.

thanks....mark[/url]

m3810 · Post by **m3810** » Sat Nov 24, 2007 1:09 am

Anybody have any further input on this..I am not sure what to do and am waiting to to put the engine back together until I figure this out.

So Cal Mark · Post by **So Cal Mark** » Sat Nov 24, 2007 1:22 am

oil is fed thru the aux shaft, so if you cut the end off it creates a large internal oil leak. You have to tap and thread the shaft then install a pipe plug

Revised "rebuild or not"

Revised "rebuild or not"

confused

any help?