Exhaust Manifold stud

smabious · 18th March 2021, 17:28

Evening.

I've noticed oil collecting on one if the Exhaust Manifold studs. It's not dripping but is coated (highlighted in pic). Anyone know why this would be on a 1.8T? This is giving a smell of buring oil not long after starting - not nice! Strange just on this one stud.

I also have a slight oil leak from the inlet Camshaft seal which is eventually getting on the top of the gearbox - I assume these are unrelated, the seal I'm replacing ASAP.

Scott.

chris75 · 18th March 2021, 20:51

This is often due to a leaking camshaft cover gasket , and might be solved by just nipping up the cover bolts

T-Cut · 19th March 2021, 08:39

If the oil is not running down from a leak in the cover gasket it has to be getting into the stud drilling from inside. The stud holes are blank, so there's no logical route for an oil leak other than a crack around the drilling. Over-tightening the stud could do that. The only way to be sure about a crack is to remove the manifold and check the drilling. If the leak is very small I suppose a good coat of thead sealant might fix it.

TC

smabious · 19th March 2021, 11:26

Quote:

Originally Posted by T-Cut

If the oil is not running down from a leak in the cover gasket it has to be getting into the stud drilling from inside. The stud holes are blank, so there's no logical route for an oil leak other than a crack around the drilling. Over-tightening the stud could do that. The only way to be sure about a crack is to remove the manifold and check the drilling. If the leak is very small I suppose a good coat of thead sealant might fix it.

TC

Thanks for the response. I've had another look and It doesn't appear any oil is coming directly from above. It's wet around the base of the stud and all over it. I wonder if the leak from the rear inlet camshaft seal is somehow running along the head/block and stopping at the the first lower stud. I'm going to change the seal today, clean up and see if that has done anything.

After that Ill try your suggestion and remove the manifold.

18th March 2021, 17:28	#1
smabious Regular poster MG ZT 160+ & MG6 Join Date: Nov 2010 Location: Manchester Posts: 86 Thanks: 12 Thanked 6 Times in 5 Posts	Exhaust Manifold stud Evening. I've noticed oil collecting on one if the Exhaust Manifold studs. It's not dripping but is coated (highlighted in pic). Anyone know why this would be on a 1.8T? This is giving a smell of buring oil not long after starting - not nice! Strange just on this one stud. I also have a slight oil leak from the inlet Camshaft seal which is eventually getting on the top of the gearbox - I assume these are unrelated, the seal I'm replacing ASAP. Scott. __________________ [SIGPIC][/SIGPIC] Copperleaf Red 1.8 Turbo (160+)

18th March 2021, 20:51	#2
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	This is often due to a leaking camshaft cover gasket , and might be solved by just nipping up the cover bolts __________________ Who said it was simples ?

19th March 2021, 08:39	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	If the oil is not running down from a leak in the cover gasket it has to be getting into the stud drilling from inside. The stud holes are blank, so there's no logical route for an oil leak other than a crack around the drilling. Over-tightening the stud could do that. The only way to be sure about a crack is to remove the manifold and check the drilling. If the leak is very small I suppose a good coat of thead sealant might fix it. TC