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[email protected]
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Joined: August 03, 2002
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Location: Salt Lake City, Utah
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 Posted: Sun Aug 20, 2017 6:58 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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that's a dropped valve guide IMO. You can probably see which one when you pop the valve covers off.
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Hatracks
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Joined: July 10, 2016
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Location: Renton, WA
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| Posted: Sun Aug 20, 2017 7:35 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| [email protected] wrote: |
| that's a dropped valve guide IMO. You can probably see which one when you pop the valve covers off. |
I will take a look there tomorrow. For a dropped valve guide is it ok to just replace the heads or should I do the cylinders also?
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vwjetboat
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Joined: May 11, 2017
Posts: 1732
Location: Florida
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| Posted: Sun Aug 20, 2017 7:37 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| Hatracks wrote: |
| [email protected] wrote: |
| that's a dropped valve guide IMO. You can probably see which one when you pop the valve covers off. |
I will take a look there tomorrow. For a dropped valve guide is it ok to just replace the heads or should I do the cylinders also? |
you wont know that till you can look at them.. if scored yes.. if still pretty .. save the $$ |
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mark tucker
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Location: SHALIMAR ,FLORIDA
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| Posted: Sun Aug 20, 2017 7:52 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| vwkirb wrote: |
Also a compression tester usually does not leak down. They have a check valve to prevent leakage near the gauge so you can see maximum cylinder pressure measurement.
A leak down test uses compressed air to pressurize the cylinder at tdc, the compressed air source is removed and then it is allowed to sit and the pressure loss is the leakage. Similar tools but set up differently. |
x2. |
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Hatracks
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Joined: July 10, 2016
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Location: Renton, WA
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| Posted: Sun Aug 20, 2017 8:01 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| mark tucker wrote: |
| vwkirb wrote: |
Also a compression tester usually does not leak down. They have a check valve to prevent leakage near the gauge so you can see maximum cylinder pressure measurement.
A leak down test uses compressed air to pressurize the cylinder at tdc, the compressed air source is removed and then it is allowed to sit and the pressure loss is the leakage. Similar tools but set up differently. |
x2. |
This compression tester blew off the air if i disconnected it so i didnt think there was a check valve. I can leak down test it properly tomorrow if I take a look at the valve guides and dont find anything.
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Hatracks
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| Posted: Sun Aug 20, 2017 8:44 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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Alright so compression test and visual inspection of the valve guides tomorrow. This just sucks because that engine felt really good when I was driving it around. I guess if I am just looking at a top end rebuild i can go with:
ACN Better than stocker heads
Whatever ratio rockers someone recommends
88mm x 69-74mm Hypereutectic Slip-In Bottom and Machine in Top Piston & Cylinder Set
Dual Weber 34 ICT kit
and wake it up a bit....and pray the bottom end stays together.
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KTPhil 
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Location: Conejo Valley, CA
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overdrive
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Joined: November 21, 2016
Posts: 75
Location: Not Sure
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| Posted: Sun Aug 20, 2017 11:05 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| mark tucker wrote: |
| vwkirb wrote: |
Also a compression tester usually does not leak down. They have a check valve to prevent leakage near the gauge so you can see maximum cylinder pressure measurement.
A leak down test uses compressed air to pressurize the cylinder at tdc, the compressed air source is removed and then it is allowed to sit and the pressure loss is the leakage. Similar tools but set up differently. |
x2. |
Somebody should school the noobs on what a leak down is... |
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Hatracks
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| Posted: Tue Aug 22, 2017 6:57 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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I forgot the leakdown tester I made at work so that will have to wait until tomorrow. I pulled the valve covers and watched while rotating the engine by hand. None of the valve guides moved and they all looked brand new, the heads look brand new. The only thing I saw is in the image below #2 exhaust valve guide looked like it has some gunk on it while the others are all shiny new. Hard to get a picture under the car.
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[email protected]
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| Posted: Tue Aug 22, 2017 7:10 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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I never understood why some head guys coat the valve stems with assembly lube, and even anti-seize. 
All it does is keep the oil out and increases wear. Maybe they are trying to keep a lot of work in the pipeline for themselves.....
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Hatracks
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| Posted: Tue Aug 22, 2017 7:25 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| [email protected] wrote: |
I never understood why some head guys coat the valve stems with assembly lube, and even anti-seize.
All it does is keep the oil out and increases wear. Maybe they are trying to keep a lot of work in the pipeline for themselves..... |
It's caked on there for sure but so far I'm not seeing anything really wrong. Hoping the leak down tells me something.
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Hatracks
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| Posted: Thu Aug 24, 2017 6:47 am Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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I forgot the leakdown tester again so I will do that today. I pulled the air cleaner off though in preparation and noticed there was a film of oil in the carb. Is it possible i have to much crankcase pressure somehow?
I did just recently pull the pressure relief valves and check them, oil pressure is about 60psi at startup and once warmed up is in the 7-10psi range at idle and 30-40 psi in the 2k-3k rpm range.
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Hatracks
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| Posted: Thu Aug 24, 2017 7:17 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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getting the leak down test done is frustrating. The tool i made really just let me listen to where air was going which didnt tell much. I went to two auto parts stores and they had no idea what I was talking about and did not stock them. So i went to harbor freight where they had one...I got it home used it once...and the gauge broke. So now I ordered a decent one of amazon and will have to wait another day.
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[email protected]
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| Posted: Thu Aug 24, 2017 7:40 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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gauge reading or not, where did you hear the leakage?
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Pruneman99
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| Posted: Fri Aug 25, 2017 2:26 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| Hatracks wrote: |
| I pulled the air cleaner off though in preparation and noticed there was a film of oil in the carb. Is it possible i have to much crankcase pressure somehow? |
How is your crank case vented? Could be simple as too small of a vent pushing oil into the carb (if you have it hooked up that way)
Maybe a picture of the engine would help. Oh and the plugs look normal to me although one picture is dark and it's hard to see. |
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earthquake
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| Posted: Fri Aug 25, 2017 2:45 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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This is what a proper "Leak Down Tester" looks like...
And yes I use it, I just don't like it to get all greasy, which is also why I don't let any body else use it.
Casey
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Hatracks
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| Posted: Fri Aug 25, 2017 4:28 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| Pruneman99 wrote: |
| Hatracks wrote: |
| I pulled the air cleaner off though in preparation and noticed there was a film of oil in the carb. Is it possible i have to much crankcase pressure somehow? |
How is your crank case vented? Could be simple as too small of a vent pushing oil into the carb (if you have it hooked up that way)
Maybe a picture of the engine would help. Oh and the plugs look normal to me although one picture is dark and it's hard to see. |
vented from oil filler to air cleaner.
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Hatracks
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| Posted: Fri Aug 25, 2017 4:36 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| earthquake wrote: |
This is what a proper "Leak Down Tester" looks like...
And yes I use it, I just don't like it to get all greasy, which is also why I don't let any body else use it.
Casey |
Yeah I ordered a good one, I have been driving and building old cars for a lot of years and never had a use for one. I did not realize how much of a pain in the ass it was to find one locally.
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vwjetboat
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Location: Florida
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| Posted: Fri Aug 25, 2017 5:03 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| Hatracks wrote: |
I forgot the leakdown tester I made at work so that will have to wait until tomorrow. I pulled the valve covers and watched while rotating the engine by hand. None of the valve guides moved and they all looked brand new, the heads look brand new. The only thing I saw is in the image below #2 exhaust valve guide looked like it has some gunk on it while the others are all shiny new. Hard to get a picture under the car.
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I see a chunk of metal at the top of the valve spring.. its tiny but its metal |
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jason
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| Posted: Fri Aug 25, 2017 8:44 pm Post subject: Re: Engine started smoking heavy - plugs pictures/compression test |
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| I have an OTC one. The amount of times I'd use it didn't justify an expensive one. Just check gauge calibration and your good. |
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