Odd Exhaust Valve Issue 1999 V70

Post by **SuperHerman** » 18 Jul 2018, 10:45

More pictures while rotating the crank would help.

Pulling the exhaust manifod, if it is an exhaust valve, will provide answers but may not provide a viable repair solution. If the foreign object is not from the car it could work. If it is a failed part from the valve it will not as the part has to be repaired from the top.

Removing the cam cover may be the quickest solution repair. You will need to do the rope technique to keep the valve from dropping further. Air won't work b/c you don't have a seal. Basically you take a rope and stuff as much as you can into the spark plug hole - this keeps the valve from dropping. With the cam cover off and the rope in you should be able to remove the valve. Unfortunately you will have to pull the exhaust cam.

Interesting post.

Post by **erikv11** » 18 Jul 2018, 12:23

SuperHerman wrote: ↑18 Jul 2018, 10:45 ... Interesting post.

Agreed, I am interested to see how this one comes out.

Post by **Clemens** » 18 Jul 2018, 13:11

Dmck wrote: ↑18 Jul 2018, 06:59 I want to see a few more pictures of that spot. It could be an illusion and we are seeing the glow from where the valve meets the head higher up in that exhaust chamber. There is a light on the camera he is using..

or at the end of the valve tunnel ...

Post by **Clemens** » 18 Jul 2018, 13:12

seriously: before taking the head off I´d still try the exhaust manifold. Just spray teh bolts with PB blaster or similar a few times before tackling the job.

Post by **SuperHerman** » 18 Jul 2018, 23:13

I agree that pulling the head is the last resort, but taking off the exhaust manifold will yield no results if the valve has a mechanical failure. A mechanical failure has to be fixed from above or below if you have a dropped seat.

True if what is restricting the valve is a foreign object removing just the exhaust manifold might be a solution. I say might because maybe you cannot get the exhaust valve to move. It has a high probability of yielding an answer, but a low probability of a solution. Does the head or exhaust show any signs of being taken apart? A foreign object has to come from somewhere.

Taking off the upper cam cover may be the best approach. It may yield a solution or it may require the head to be pulled as well as the exhaust manifold. I think what ever is accessible from the exhaust manifold will be accessible from the removed cam cover, cam shaft, and tappet.

My reluctance of pulling the exhaust manifold is if you can do the repair from above you will not have to disturb the exhaust manifold.

Regardless you have some work ahead of you.

Post by **nickelghandi** » 21 Jul 2018, 08:43

Yeah this has me puzzled and intrigued as well. Thanks for all the replies, seriously. You guys always have ideas that don't even cross my mind. So stuff rope into the spark plug hole? That is a new one for me. I guess nylon will work best because of lower risk of losing fibers in there and gumming things up later.

I will leave the exhaust intact for now. I think pulling the valve cover will be the easiest/best option as far as finding out what is going on. Before any of that though, I think I am going to try to get the camera in there again to see if I can get a better image of that foreign object (if it even is one). I am also thinking it could be oil reflecting the light and causing some artifacts on the image.

One thing though, for now, I have no way to time the car once I start putting things back together. The upper timing cover is missing. PO thought it needed to come off to remove the top engine cover. I guess I can probably find one in a junk yard or online. Are they all the same or should I shoot exclusively for a 99 V70 with a Light Pressure Turbo?

Post by **abscate** » 21 Jul 2018, 12:32

I think they are the same but you do need a 99. I can't remember if I stripped it off the parts car but can check, or check my part out thread in that Forum

If you are karmically due its a freebie, if you got the dough, ill take the blow.

(TMI)

Dmck · Post by **Dmck** » 21 Jul 2018, 13:43

nickelghandi wrote: ↑21 Jul 2018, 08:43 Yeah this has me puzzled and intrigued as well. Thanks for all the replies, seriously. You guys always have ideas that don't even cross my mind. So stuff rope into the spark plug hole? That is a new one for me. I guess nylon will work best because of lower risk of losing fibers in there and gumming things up later.

I will leave the exhaust intact for now. I think pulling the valve cover will be the easiest/best option as far as finding out what is going on. Before any of that though, I think I am going to try to get the camera in there again to see if I can get a better image of that foreign object (if it even is one). I am also thinking it could be oil reflecting the light and causing some artifacts on the image.

One thing though, for now, I have no way to time the car once I start putting things back together. The upper timing cover is missing. PO thought it needed to come off to remove the top engine cover. I guess I can probably find one in a junk yard or online. Are they all the same or should I shoot exclusively for a 99 V70 with a Light Pressure Turbo?

You can time the car using the back side of the cams under the rotor and cam sensor. Also the crank has a tiny very tiny divot that lines up with a line on the oil pump. If you line that divot up with the cams grooves on the back being completely line up flat with the head it's on timing

Post by **nickelghandi** » 21 Jul 2018, 14:18

Abscate, I would just buy it from you or elsewhere if what you have wouldn't work. Karma has been pretty good to me lately other than this one issue!

Dmck, thanks. I will keep that in mind.

After some cranking and more camera inspection, it appears as though the valve is most likely bent and there could be other valve damage, but that will be the least of my concerns. See the picture below:

That is just out of eyes reach when peering into the cylinder, and my camera is so bad that it was likely concealed. Also the cylinder has had large carbon build up which could have concealed this damage somewhat. That is the piston head. Flat everywhere except where it lines up with the valve in question. I wish I had seen this before my OP, but it is what it is.

My suspicion... timing belt broke on PO who then had it changed in hopes it would be okay. It wasn't. Still, I got the car so cheap that I can easily make my money back even if I simply junk it. I paid $160 for the car. So... now what? Essentially the car was free so what would a new engine set me back? $1,000, $2k, $3k? How much is too much? My neighbor has a shop bigger than his house and owns a repair place in the area. Some beer might get me a few days to work and use his equipment. I have 3 other vehicles so this isn't something I need done ASAP. Is it worth it to just pay someone else and get a warranty? I really like these cars so I am considering replacing the engine as an option.

Post by **FLXC90** » 21 Jul 2018, 14:26

If it is foreign object obstruction, it would have to come from the cylinder. Perhaps a piece of spark plug electrode? or perhaps valve seat material. There is not enough clearance between the stem and guide for anything to "fall" into the valve pocket without it being very obvious.

With plugs out and camera in, rotate the engine to compare extension of the open exhaust with its mate. Due to piston you may have to do this through exhaust port.

If it is debris, the valve may have embedded it and you may have to work to free it. In that case you will probably have some leakage due to seat surface damage. If it is and you can remove it, follow-up check will be required to see if the valve is bent and/or if it seats.

Best of luck, let us know what you find

OK, so I got that off just not quite in time! You have a bent valve. I doubt it jumped time, or both valves would be bent, and probably in more than one cylinder. Disassemble to determine what the blockage is. Use a file or Dremel to blend out the damage to the piston crown, head gasket and drive it.

Odd Exhaust Valve Issue 1999 V70

Re: Odd Exhaust Valve Issue 1999 V70