|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
05-27-2020, 11:17 AM | #1 |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Engine inspection (with pics)
So, I pulled the head to change the gasket and inspect the cylinders. What I found was zero ridge except for cylinder 3 has just the SLIGHTEST hint of a ridge. Could be carbon. Pistons are .100 over, cylinder walls have NO cross hatching at all. So this is after 300 miles using 5 quarts of oil. Plugs should be a lot more fouled if it was burning that much IMO. The wife was following me the other day and said that it is smoking a bit. I'm thinking perhaps pulling the pistons, deglaze the cylinders, new rings and it should be good. Not convinced that all that oil when through the cylinders so must be leaking more than usual somewhere. Thoughts??.
[IMG][/IMG] [IMG][/IMG] |
05-27-2020, 11:22 AM | #2 |
Senior Member
Join Date: Jul 2015
Location: SouthWest Michigan
Posts: 363
|
Re: Engine inspection (with pics)
sounds like a good idea
check and clean the valves while your at it |
Sponsored Links (Register now to hide all advertisements) |
|
05-27-2020, 12:09 PM | #3 |
Senior Member
Join Date: Dec 2014
Location: Shawnee, Ok
Posts: 3,471
|
Re: Engine inspection (with pics)
Lap your valves while you're there, it's cheap, quick and easy
__________________
Keith Shawnee OK '31 SW 160-B |
05-27-2020, 12:23 PM | #4 |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
|
Re: Engine inspection (with pics)
First question, are the spark plugs in order from #1 (L) - #4 (R)?
My initial observation is oil is possibly coming from the valves. The fuel mixture appears to be close based on spark plug tips. The carbon appears to following the suite of the combustion chamber which would indicate to me that it is originating from valve guide area and not piston ring. Typically you see more even spread of carbon around the entire piston top when it is the oil rings that are worn. To totally diagnose this, it would be better to see the margin of the valves, the seat surface, check concentricity, and valve stem to guide clearance. I would also like to measure the bore with a feeler gauge to see how loose the piston is in the bore, etc. |
05-27-2020, 12:44 PM | #5 |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
no the plugs are not in order. Another observation, the head mimics the pistons in that the combustion chambers are black/sooty with a little bit of carbon buildup and the flat area is shiny but all had a light coating of oil. Also the carbon was "wet" on the head right above where the buildup is on the pistons.
|
05-27-2020, 05:42 PM | #6 |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
Sponsored Links (Register now to hide all advertisements)
|
05-27-2020, 10:44 PM | #7 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: Engine inspection (with pics)
Mic the cylinders top and bottom.
Just a guess. I've read that when cylinders are bored over, pistons have to be replaced with correct sized pistons/rings. Perhaps someone did not replaced the pistons. |
05-28-2020, 04:21 AM | #8 |
Senior Member
Join Date: May 2010
Posts: 1,304
|
Re: Engine inspection (with pics)
Just off topic slightly I have an engine with all compression reading just under 70 PSI but has heavy blow by at the oil filler so must be worn valve guides. I did not want to fit the extended oil filler gizmo as they aint pretty IMHO . I fitted the much larger model "B" filler and no blow by oil drops/mist and looks good too . I suppose in USA these "B" oil fillers could be difficult to find as not many 4 cylinder 1932 onwards cars were built . They can be found in UK as the "B" engine was built in Dagenham into WW2 . English "B" fillers are one piece construction not two piece as USA but have the same cap .
John in really lovely sunny hot spring weather Suffolk County England . |
05-28-2020, 08:01 AM | #9 |
BANNED
Join Date: Dec 2019
Posts: 1,196
|
Re: Engine inspection (with pics)
From a cost perspective the most expensive part of a rebuild is rod and main bearings,crankshaft and connecting rods.The cost of sleeving bores is up there too. Alot can be done to improve an engine that has decent rod and main bearings and minimal crankshaft thrust without getting too deep cost wise.In versely,a lot of time an money can be wasted trying to 'save' an engine with worn bearings..Engines need to be looked at as a whole,all processes must be in specification for long life,at .100 over with questionable bores and valves my next move would be a bearing inspection if it passes bearing inspection honing bores is a possibility if the bore measures correctly,lapping valves if the seats aren't too far gone,basically an old fashioned overhaul..
|
05-28-2020, 08:02 AM | #10 |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
I've never heard of someone boring a block and not replacing the pistons but that doesn't mean it didn't happen. Would be odd since pistons for these are so cheap but maybe it was someone that just didn't know??. You may be on to something there.
|
05-28-2020, 08:12 AM | #11 | |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
Quote:
|
|
05-28-2020, 09:19 AM | #12 | ||
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
|
Re: Engine inspection (with pics)
Quote:
Quote:
That is why I suspected & suggested worn guides. Unless you have a decent selection of metrology, you are not going to be able to tell much regarding bore size and piston clearance. The other thing you need to determine is just how far do you want to go with this project? |
||
05-28-2020, 09:31 AM | #13 | |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
Quote:
|
|
05-28-2020, 09:45 AM | #14 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: Engine inspection (with pics)
Again am arm chairing here, but could swear I have read or heard when cylinders/rings are wore, some honed the cylinders and installed over sized rings to get by. You never know what farmer fixes have been done on a 90 year old car, by people going through tough times - some of what you refer to as a "Junk Restoration".
|
05-28-2020, 09:53 AM | #15 |
BANNED
Join Date: Dec 2019
Posts: 1,196
|
Re: Engine inspection (with pics)
There isnt anything bad about building the car to meet what you want. Guides are cheap,so are rings and lapping compound. No engine will tolerate a piston .025 smaller than the bore,your 'slugs match your jugs'..dont worry about being able to wiggle the piston some,wall clearance is way better loose than tight.You know what to do...good luck..
|
05-28-2020, 10:24 AM | #16 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,508
|
Re: Engine inspection (with pics)
Quote:
Yes, it is often difficult to find a stopping place, but replacing guides & valves, re-ringing it, and tightening up the lower-end clearances should put you on your way to many happy miles. |
|
05-28-2020, 10:29 AM | #17 |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
Might be a while before i can get to putting it back together. Weather cleared and will be going back to work. Unwell report back when It's back together and i have a chance to drive it and check the oil consumption but I think Brent hit the nail on the head with the guides. I still don't get why the plugs are not fouled from that much oil consumption but we will see.
|
05-28-2020, 10:45 AM | #18 | |
Senior Member
Join Date: Aug 2016
Location: Alberta
Posts: 930
|
Re: Engine inspection (with pics)
Quote:
|
|
05-28-2020, 10:58 AM | #19 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,084
|
Re: Engine inspection (with pics)
Licensed, get modern straight-stem valves and guides, they are made to tighter tolerances and will seal better and last longer. Use guides with the step, that looks like original guides, the spring will hold them in place.
John C, blow by is caused by gases blowing by the rings, not valves. |
05-28-2020, 11:14 AM | #20 |
Senior Member
Join Date: May 2010
Posts: 2,592
|
Re: Engine inspection (with pics)
PM sent
Last edited by Benson; 06-10-2020 at 01:53 PM. |
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|