new tech tip and question

scotty914 · 02-21-2001, 05:32 PM

while tring to get my motor back together i could not get the rings compressed enough to get the cylinder on i even tried to use the brass strip that i read about somewhere ( haynes ) so i dug through the tool box and found a strap type oil filter wrench ( metal strap and lever ) that was a perfect fit and gave me plenty of leverage . all i had to do was grind off one side of a rivit so i could take it apart after i got the cylinder on

now the question can i paint the push rob tubes, they are stained and minorly corroded

scott thacher
75 1.8 under construction
75 under rust
(fine german rust)

scotty914 · 02-21-2001, 05:37 PM

me again also the oring for my push rod tube ( small end )seem a little lose ... how tight should they be, similar to the large end ?

scott thacher

Bleyseng · Bleyseng's Garage

Do not paint the tubes as they do get rid of alot of heat from the oil. Clean them up carefully with steel wool. If they are rusty where the o rings go get rid of them as they will leak oil. They are cheap to replace. If I remember right the small o ring is loose. Install the tubes with motor oil wiped on the o rings so they slip in. Do not pinch the o rings!! Be very careful with them.
Geoff

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76 914 2.0L

DDS · 02-23-2001, 01:38 AM

I refurbed my pushrod tubes by cleaning them on a bench mounted wire scratch wheel then I painted them. Apparently they are prone to occasional pin-holes so if they are really shabby replacing them is probably a good idea. They aren't expensive.

The o-rings are standard 22 and 24 mm I believe and probably should be replaced 'cuz they are really cheap and can leak. (check local belt/bearing suppliers or Pelican) Viton seems to be the material of choice.
Dave

SteveStromberg · 06:31 PM

For the minor cost of the pushrod tubes I think its false economy to reuse the old tubes.Why try and save a few dollars when if they leak you will have to do the job over? I ALWAYS replace them with New tubes.Steve

scotty914 · 02-23-2001, 12:41 PM

the tubes are not bad enought to replace they are in good shape except the stains and i did get new oring i was just wondering if i could paint them ... i guess i can with high temp paint

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scott thacher
75 1.8 under construction
75 under rust
(fine german rust)

JP Noonan · 02-23-2001, 01:02 PM

According to Bob Hoover and Tom Wilson you don't want to use high temp paint on the barrels or pushrod tubes because that type of paint insulates in the heat. High quality flat black spray paint works better.

To help disapate even more heat clean and paint the cylinders.

Painting the heads and block doesn't help because the aluminium already transfers heat well.

JP Noonan · 02-24-2001, 05:28 AM

Just a thought...

Were they by chance new rings? Or you just putting the old rings and pistons back in the same bore that they came out of?

If they were new, they need to be filled to fit or the rings will expand and break in the first start-up. Same goes if you put rings and pistons back into a different cylinder than they came out of.

scotty914 · 02-24-2001, 05:52 AM

they were new rings but i checked all the specs and they are with in spec for gap and groove and the paint i have is engine enamel that says it will withstand 500 degrees

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scott thacher
75 1.8 under construction
75 under rust
(fine german rust)