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AWD - Big Oil Leak At 3000 RPM, From Where?

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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

I have an oil leak at the timing belt end of my 99 V70, non-turbo. I have been trying to find the source for a while, but the other day I needed to replace the alternator, so I investigated some more. I found a broken vacuum line connector behind the power steering pump that connected the intake manifold to a hose that disappeared behind the intake manifold, and thought it might supply the crankcase ventilation system, but repairing it did not help.

I have done the rubber glove finger test on the dipstick, but the results seemed not to be conclusive. Mostly a vacuum is apparent, but occasionally the finger stands up. I connected my Mighty Vac to the dip stick tube, and the needle did not move. The Mighty Vac can also register small positive pressure, and it is quite sensitive. I suppose it is possible that a seal has already been blown out, which would not allow either a pressure or vacuum reading.

While changing the alternator, I removed the top and front cover of the timing belt area. The timing belt is dry, and the back sides of the cam wheels are dry. The back side of the crank sprocket cannot be seen. The auxiliary drive belt has been getting well oiled.

With the T-belt covers off and the engine idling, I watched for a leak and found none. Then I held the engine (sitting in the car) at 3000 RPMs for a while, and when I looked, I found oil had been dripping off of the front (right side) of the engine. I was by myself, so I propped the throttle to 2500 RPMs to watch the engine in action, and I saw no leaking. Then I propped the throttle to 3000 RPMx, and observed a small steady stream of oil running off of the inside plastic timing cover at about where the rear lower tab for the outer cover locates. However, because everything is so jammed in there and hard to see, I could not actually see where the oil is coming from.

This is a large leak. It is a small continuous stream, not just a drip, but only starting at about 3000 RPMs, or at least something over 2500 RPMs.

Because of the location, I suspect either the front main seal or the oil pump. But, I would like to know if there is anything else on the front (right side) of the engine that is likely to leak. Part of my problem is that if strip the timing belt and sprockets off of the engine, and the cause is not apparent, I can no longer run the engine to observe the leak.

So, are there any ideas for likely sources of the leak?

Thanks, Charley





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

David, Thanks for the clarification on the location of the plate. It was a good thought, but I think the leak is from higher than that point.

Yesterday I needed to make a round trip of a bit over 300 miles, and neither of my MGs are running or insured, so I had to take the Volvo. I packed a jug of oil and headed out. After seeing that the leak showed at 3000 RPMs and not at 2500, I set the cruise control to about 2300 for an indicated speed of about 59 mph.

I checked the oil often, and it was fine. Back home and parked at the starting point, there is no noticeable difference on the dip stick from when I started the 300 mile trip. So, the leak really is RPM related. That seems odd to me.

My next attempt to find it will be to see if I can remove the back plate of the timing belt cover to get a better look. Does anyone know if this can be removed with the timing equipment in place?

Have a good 4th of July,
Charley





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

I don't know if the CAM sprokets interfere or not, BUT the water pump has to come out for it to come out completely.

If you try to remove it without first taking the water pump out you will break it.

There are also 3 bolts that hold it in place. The tensoner and Idler pulley will have to also be removed.

Hope this helps.

Matt
--
1989 - 245, 1990 - 245, 1991 - 245, and 1993 - 245





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

Thanks for that info, Matt. Even though it is not what I was hoping to hear, it is what I asked for.

Charley





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

Thanks Klaus, I believe you are right about the oil pump being in that area, and I think that the front main crank seal is in the nose of the oil pump. One reason I think it might be leaking somewhere else is that I don’t see oil coming straight down from the crankshaft center. I see the oil running off of the timing cover plate back cover rearward of the crank center. Also, I was thinking that the non-turbo models don’t have an oil cooler. Am I wrong about that?

Thanks David, is that block-off plate on the end of the oil pan, or is it up higher on the engine block? I know there is a block-off plate on the pulley end of the oil pan that is about 1 inch tall and maybe 2-1/2 inches long. It doesn’t seem to be leaking, and it is lower than where I see the oil running out. Is that the plate you are thinking of, or is there another one that I haven’t seen yet?

Does anyone know if the back plate of the timing belt cover can be removed with the timing belt and sprockets still in place?

Thanks, Charley





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

It was the one on the pan.





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

There is a seal in the front oil block-off plate that fails and makes a big mess. Could be your source.





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Big Oil Leak At 3000 RPM, From Where? V70-XC70 1999

From your description, the oil pump is in that area. So is the oil cooler.

https://www.youtube.com/watch?v=GF5jclEsLGM
--
Keeping it running is better than buying new





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