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1998 S70 Mysterious Oil Leak

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kickin_it
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Year and Model: 1998 S70 GLT
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1998 S70 Mysterious Oil Leak

Postby kickin_it » Wed Oct 30, 2013 2:26 am

I am trying to conquer an oil leak that I have had for quite some time. Oil all over the place but mainly on the front of the motor. I have cleaned the front of the motor and have located a drip, see attached video.



The drip is coming off of the rear timing cover. The oil is NOT coming from the cams, they are clean. The oil is NOT coming from the top of the valve cover, though it was covered in oil, this drip was occurring after the valve cover was cleaned and remained cleaned. I am assuming the only other possible location would be around the crankshaft/oil pump. The oil seems to be dripping and then getting on to the timing belt which then throws it everywhere, not to mention all of the other spinning gears on the motor.

The scary part though, it seems my PCV system is clogged. The entire system was replaced when I replaced the head gasket back in December of 2012. I only assume it is clogged because I am again getting the slight smoke out of the dipstick and some positive pressure.

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rspi
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Re: 1998 S70 Mysterious Oil Leak

Postby rspi » Wed Oct 30, 2013 3:16 am

Do the glove test to see if the head has pressure. If you did a head, you can have a cam cover leak. My bet would be on the rear cam seal, but it can be the crank (have never read about a crank seal leak).

Clean it all up, start the car and shut it down quick. The way that is dripping, you should see it pretty fast. You can look behind the cam and see if the seal is out a little.
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rspi
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Re: 1998 S70 Mysterious Oil Leak

Postby rspi » Wed Oct 30, 2013 3:18 am

Image

Image
'95 855 T-5R, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow
Donate Today - Volvo Repair Videos

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rspi
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Re: 1998 S70 Mysterious Oil Leak

Postby rspi » Wed Oct 30, 2013 3:19 am

That rear cam seal will drip down behind the cover. If the belt is wet, you should replace it as well.
'95 855 T-5R, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow
Donate Today - Volvo Repair Videos

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kickin_it
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Re: 1998 S70 Mysterious Oil Leak

Postby kickin_it » Wed Oct 30, 2013 10:48 pm

I have cleaned the motor. The cams, from what I can see by manipulating the rear cover, appear to be clean and not dripping oil, hence the reason I assumed it was crankshaft and not the cams.

Am I correct in calling these the front cam seals in reference to the way the motor sits? You stated it was possibly the rear cam seal, would this be referring to the exhaust/intake (left/right) seals? Just a bit confused.

I cannot remember from doing my head job, but is it possible to remove the rear timing cover (plastic) without removing the belt, cam gears, water pump, etc...to obtain a better view?

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rspi
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Re: 1998 S70 Mysterious Oil Leak

Postby rspi » Wed Oct 30, 2013 11:46 pm

I meant the exhaust cam seal. The front of the motor is the side with the timing belt.

You will have to remove everything including the harmonic balancer to get the lower timing belt cover off. If that front exhaust cam seal looks fitted properly, you either have a cam cover leaking or maybe the crank seal (which I doubt).
'95 855 T-5R, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow
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kickin_it
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Year and Model: 1998 S70 GLT
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Re: 1998 S70 Mysterious Oil Leak

Postby kickin_it » Wed Nov 06, 2013 1:54 am

So I took a gander under the hood today. The cam seals are not protruding out like pictured above. I do have oil on top of the valve cover though after cleaning thoroughly. I will snap a pic tomorrow when I have some light. The odd thing is, I do not think it is coming from the oil cap, I do not see any traces of oil from the cap or on the short stem. Majority of the oil is on the front of the engine (passenger side). If not the oil cap I feel there may only be two explanations, either the oil drip is getting on the belt and gears and flinging upward to meet the hood and drip down on to valve cover and collect or the PCV hose next to oil stem is leaking. I tried the look on the backside of the hood to see if I could find any trace of oil splatter but unfortunately my light was not very good. I am a bit confused and do not have access to a lift that would help tremendously in a diagnosis.

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kickin_it
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Year and Model: 1998 S70 GLT
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Re: 1998 S70 Mysterious Oil Leak

Postby kickin_it » Thu Nov 07, 2013 3:39 am

Here are some new pics of the issue stated above.
Attachments
2013-11-06_16-32-23_367.jpg
Oil cap; no real evident sign of oil leak on or around stem or cap
2013-11-06_16-32-13_750.jpg
Front of intake cam
2013-11-06_16-32-05_839.jpg
Front of exhaust cam
2013-11-06_16-31-58_941.jpg
Oil on valve cover after cleaning cover

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kickin_it
Posts: 213
Joined: Thu Oct 27, 2011 6:52 am
Year and Model: 1998 S70 GLT
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Re: 1998 S70 Mysterious Oil Leak

Postby kickin_it » Thu Nov 07, 2013 10:26 pm

OIL EVERYWHERE!

Took the ole S70 to a pick a part to get a seatbelt for $11.00 and ran into some issues. I put some oil in her before we left and hopped on the road, I jumped on the gas to stretch her legs and saw a good puff of smoke, which was new. After all was said and done and I made it home, it appears the Volvo blew the PCV elbow that sits in on top of the valve cover, just to the left of the oil cap. It is no where to be seen and I assume tells me I have a very clogged PCV system. Any opinions?

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Re: 1998 S70 Mysterious Oil Leak

Postby difflock54 » Fri Nov 08, 2013 2:51 am

Highly likely yes.
Mind you the elbow may have been loose anyway and chose that moment to part company.
Roberts (rspi) advise about glove test will answer that for sure.


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