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> Should these be touching? (Pushrod tube and manifold)
mcswiggs
post Jun 20 2019, 12:57 AM
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Hi guys - this is my first proper post and I’d welcome your advice.

I bought my ex-Colorado ‘74 2-litre about 18 months ago and have concentrated so far on a total rebuild of the engine.

The engine is back in and I’ve just completed the cam burn (scary). I’m now left with a couple of oil leaks from the pushrod tubes at the case end, both on cylinder no4. The heat exchanger was a complete pig to fit, and the manifold is actually touching the pushrod tube on No 4. Is this normal?

The tubes are new but are exactly the same diameter as the old ones. I’m thinking of putting a bit of a dent in the tube to give it some clearance passed the manifold. Any suggestions welcomed!


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JFG
post Jun 20 2019, 06:21 AM
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no they should not touch. iwouldn't dent the pushrod tube as you'll risk rubbing or distortion of the tube.

Something id not right with the fitting of the exhaust. is is properly seated in the head?
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mcswiggs
post Jun 20 2019, 12:39 PM
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It was a real wrestle to get the exhaust/HX on - it basically banged up against the first tube and wouldn't go over the studs on the head. It need some brute force persuasion.

I believe it is properly seated on the copper seal; it would be really loud if it was leaking badly there and the seal was lovely and snug when i popped it in. The exhaust/HX was tight against the tube all way down as i screwed it in, and even if there was another 10mm of travel left they would still be touching.

At a bit of a loss... (IMG:style_emoticons/default/confused24.gif)

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porschetub
post Jun 20 2019, 11:05 PM
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QUOTE(mcswiggs @ Jun 21 2019, 06:39 AM) *

It was a real wrestle to get the exhaust/HX on - it basically banged up against the first tube and wouldn't go over the studs on the head. It need some brute force persuasion.

I believe it is properly seated on the copper seal; it would be really loud if it was leaking badly there and the seal was lovely and snug when i popped it in. The exhaust/HX was tight against the tube all way down as i screwed it in, and even if there was another 10mm of travel left they would still be touching.

At a bit of a loss... (IMG:style_emoticons/default/confused24.gif)


You can't have this contact,you will also cause excess exhaust heat to that tube and limit it moving as the engine expands.
Dimple the exhaust pipe or get that pipe moved and rewelded away from contact,don't mess with the tube.
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