 Should these be touching? (Pushrod tube and manifold) |
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| mcswiggs |
 Jun 20 2019, 12:57 AM
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#1
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Newbie  Group: Members Posts: 22 Joined: 31-January 18 From: London, UK Member No.: 21,845 Region Association: England  |
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! Attached thumbnail(s)  
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| JFG |
Jun 20 2019, 06:21 AM
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#2
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Senior Member Group: Members Posts: 686 Joined: 7-April 16 From: Wales Member No.: 19,869 Region Association: None |
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 |
Jun 20 2019, 12:39 PM
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#3
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Newbie Group: Members Posts: 22 Joined: 31-January 18 From: London, UK Member No.: 21,845 Region Association: England |
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 |
Jun 20 2019, 11:05 PM
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#4
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Advanced Member Group: Members Posts: 4,703 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
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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Posts in this topic
mcswiggs Should these be touching? (Pushrod tube and manifold) Jun 20 2019, 12:57 AM
Olympic 914 Sometimes the copper gaskets fall out of place whe... Jun 20 2019, 06:48 AM Mike D. I have had this problem when a broken exhaust stud... Jun 20 2019, 01:41 PM
914sgofast2
I have had this problem when a broken exhaust stu... Jun 20 2019, 07:16 PM dr914@autoatlanta.com of course they should not be touching as previousl... Jun 20 2019, 01:51 PM SirAndy
If it immediately starts to rub the tube, someth... Jun 20 2019, 02:53 PM rhodyguy Did you do the grinding at the closest point to th... Jun 20 2019, 04:54 PM mcswiggs Thanks everyone who responded- really good insight... Jun 23 2019, 11:44 AM |
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