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Jmark 10-27-2006 09:05 AM

New engine has to come apart
Well, I've been chasing my high oil consumption problem on my 355 that I built and its getting worse. #2 plug is again covered in oil and ash deposits. Pulled the plug yesterday after only a week and it's pretty ugly. The rest are fine. Guess it's time to either sell it or fix it. This sucks! sigh!


k-star 10-27-2006 09:10 AM

Mark,,it's all those washers!!!!L.O.L. just kidding

What all did you check so far??? Is the engine pulling oil throught the intake gaskets,, do you have sealer on the roker studs???


malc 10-27-2006 09:27 AM

Ive got a thread running with a similar problem, my most fouling plug is 7.
I thought of valve seals first and Ill do those, next Ill do the manifold.
Does yours misfire ?

Jmark 10-27-2006 09:41 AM

Hi Keith. Studs are stock press in, 882 heads. Intake gaskets were replaced last week and replaced the intake too! About to spring a water leak. Checker had the Performer on sale thankfully.

It's been using oil since day one and is getting worse every week! I guess the next step is to pull the VC and then the rockers and springs on #2 and see if the valves wobble in the guide and ck the seals too. The seals are the positive seal type, not the crappy O-ring thing.

Malc....No misfire, no smoke on startup or visible when driving, but #2 plug turns into a crusty ash covered mess in just a few weeks now. Burns about a quart every 500-600 miles, apparently all on one cylinder. I'd live with the oil consumption of it was spread between all 8, but all on one cylinder is not good. Did a compression ck about a month ago and all were fine. None varied more then 3 or 4 pounds from each other. Average comp. was around 163.

Just sucks to spend so much time and money and have it go south. Plus i've got no time to do it as work is busy and the only place to tear it down now is next to the shop outside. Will have to pull the cabover camper off my other truck so I have something to drive, which means I'll have to rent a place to store the camper since I have no more room here! LOL When it rains, it pours. Seriously thinking about buying a new, or newer truck. Been driving this thing for over 23 years now.

This is a pic of #2 when I pulled it 2 weeks ago. Just pulled the new one that I replaced it with this morning and its getting there. Oil on the threads and seat and ash deposits starting to develop too.

I"ve got a good 400 block in the shop that I suppose I could get ready to go. Atleast I"d be able to do the R&R in a weekend and be back on the street.

cj11l 10-27-2006 10:26 AM

Engine oil consumption
Guys, if it were me, I would do a few diagnostics first before tearing anything apart.
One quick check would be to do a cylinder leak-down test. Get the piston at TDC on compression stroke, fill the cylinder with air using fitting in the plug hole and listen for escaping air. If you hear air leaking into the pan, well that means a problem with the piston/ring. Leaking into intake/exhaust manifolds, probably valves.

Most people check compression only, which is ok, but that really doesnt pinpoint the problem area.

Chris Laarman
Ottawa Engine and Performance

johnsongrass1 10-27-2006 10:40 AM

This sounds like a ring problem to me.

I agree that Cranking compression doesn't tell you much.

malc 10-27-2006 10:56 AM

1 Attachment(s)
Check this out.

johnsongrass1 10-27-2006 11:01 AM

Yours are oily though.

The oil cools the plug and those deposit's begin to collect. Then the oil covers it all up.

larryblack 10-27-2006 11:07 AM

I have seen that happen when one of the rings was put in upside down. Instead of scraping the oil down, oil is pushed into the combustion chamber.

k-star 10-27-2006 11:09 AM

IMO that thing needs to come out.. I don't think a vavle guide/seal can trash a plug that bad in 2 weeks. You can leak it but i really don't think it's going to change the final result.

I might do one last thing.... change the plug wire to that cylinder with one from another and see if the problem follows the wire, or stays with that cylinder... I have had wires that will ohm ok but still not work under load...

All in all i think it needs help..


Jmark 10-27-2006 11:16 AM

Well, I have another idea. Some may remember this thread that I had 10 days ago with the first foulded plug.
Click here.

While I did change out the intake and gaskets, I still did NOT figure out where all the oil was coming from that had covered the whole inside of the intake and heads. Was just talking to another engine friend and he knows the whole story and asked what ever came of the PCV problem of sucking so much oil that it covered the intake and heads. DUH! Totally spaced that out. So his suggestion was to delete the PCV valve and run a hose up into the air cleaner and see if the sucking oil problem stops.

I'm running tall Proform covers and the baffles "looked" good but who knows, the PCV could be sucking tons of oil at highway speed. Also, #2 intake runner is directly under where the PCV dumps from the carb port. IF the hose has oil in it after I shut it off, it could be draining into the intake and running right into #2 cyl since my truck leans hard to the right when parked in my driveway. (crooked driveway, not the truck!LOL)

So, i'm off to the shop to re-route a hose from the VC to the aircleaner and run it for 2 weeks and see how the plug looks. Going to install a brand new plug while i'm at it for good measure. Glad he called! Maybe this is it!


Jmark 10-27-2006 11:18 AM


Originally Posted by k-star
IMO that thing needs to come out.. All in all i think it needs help..


Keith!!! Bite your tonge!!!! LOL

Jmark 10-27-2006 12:17 PM

Ok, going to give this PCV thing one more shot. I ran that hose into the bottom of my aircleaner like the other side VC is run, just venting both into the aircleaner housing. IF the pcv is vacuuming the oil out of the baffle, this should solve that by just venting it into the aircleaner. Time will tell.

I removed the valve and found a rubber sleeve in my box that bushed up the 3/8" line so its a snug fit in the PCV gromment.

Then, after laying the 10 day old PCV valve on the table, I noticed it was soaked with oil.

I also put in a brand new plug in #2 so I can see any changes in a few days.

Just for reference sake, here is a picture of the 10 day old plug as it came out this morning. BTW...had to add another quart today!

I'll ck it again in a week or so.


malc 11-03-2006 08:08 AM

Has that plug got oiled threads ?
The motor I have now and its predesessor oiled the plug threads real bad.
Having nearly choked myself running two valve cover filters sans PCV,
I went for a run today with replaced PCV, still miss firing, BUT NOT number 7,
seems like another has taken over the task :pain:
Ive ordered valve stem seals, so next weekend its that and manifold resealing. :smash:

Jmark 11-03-2006 10:06 AM

My threads are ALWAYS oily, all the way to the seat. 2 days ago, I indexed the plug then pulled it out. The clean side is directly facing the exhaust valve and the dirty/oil side faces the intake valve. I think I may have a guide or seal problem too. As soon as I get some time, i'm going to pull the VC and ck the seals and stem movement.

Might not hurt to go pull the plug and see how its doing, been 7 or 8 days now on this plug.


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