mystery hose (2)

[Moloko]

If its going into the timing cover maybe the owner thought the timing cover needed a little extra oil inside?

[BtnkBndt]

This is the thread about the other end I think? From the intake bolt to the block??? Got to vent those bolts you know???


http://67-72chevytrucks.com/vboard/s...threadid=76720

[sactoC10]

OK, here it is, a bit smaller...you can see the water hose and the front of the intake manifold here, just above the lower fitting...into the block.

[N2TRUX]

Oh, now I see. I guess I missed the other thread. Hmmm? What were they trying to do. I think maybe RussTburb
is on to something here. It appears the PO screwed the pooch, and needed a fix. Its my guess too, but I bet somehow they broke off an intake bolt, and over drilled the hole....

[tom hand]

Ok I see it now...It is hooked to the cam oil galliery.... I bet if you remove the other end from the intake it is a hollow bolt made just for that purpose...cdowns hit it on the first post...it is for an oil cooler that has been removed. I would remove it right away...without the resriction of the cooler I'm sure it is dropping your oil pressure a few pounds...

[jamis]

If thats is one of the two center mainfold bolts then they are not blind threads. The thread leads in to the lifter galley. So the oil pressure from the lifter feed bore is dumping in the lifter valley.

This could have been a crappy set up for a number of things like a pypass oil filter system. There are all kinds of guffy filter systems on the market to help you go longer between oil changes. Here we use one called Puradyne. What you do is take a source of low volume oil pressure and run it threw some high tech crap and the return it back to the engine any where it leads to the sump (oil pan, valve covers, lifter valley.etc..


This is just one of many crazy scenrios of what that was.

[Class of 69]

A bypass filter, or oil cooler is the most sensible assumption here. I forgot the center bolts are drilled thru in that location. It would provide a return path for the cleaned, or cooled oil. I still agree with Tom hand...it needs to be removed, and the hole in the block plugged with a pipe thread plug. When you remove the 90 degree fitting from the block, take it to an auto parts store and find a brass pipe plug the same size. Use thread sealant on it, and tighten it in...not super tight...as the brass, and sealant will keep it from leaking. The intake should just need a replacement bolt of the size noted above. Again, clean the hole in the intake with carb cleaner, and coat the bolt well with the sealant. Hopefully, it will just thread right in, and torque it to 35 ft lbs. This should put an end to the mystery hose....but it's been damn fun to work with!!!

[bpmcgee]

I'd make sure to take the fitting with you. Since it appears to be going into a hole that would have already been threaded, it's possible that they didn't use a pipe-threaded fitting, but a brake fitting, which would use standard (no-tapered) threads.

Very strange setup. I thought oil coolers would generally take off from the bottom of the block.

Brian

[gonebad2]

I wonder if th PO was trying to get more oil to the lifter valley for some reason.

[Hooter]

maybe he felt that his motor didnt burn enough oil?

[frogsmakr]

could be blocked internal oil passages to the cam.......maybe the PO was trying to buy time

[Bilgewiper]

sorry to wake up a Old thread but I have seen some weird stuff like that on some old direct drive inboard boat engines that were mounted at a extreme angle to get the prop shaft out of the boat. I guess some had oil return problems/etc. maybe the motor orginated in a boat?