"GRawesome" (GRawesome)
10/20/2013 at 15:33 • Filed to: None
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"GRawesome" (GRawesome)
10/20/2013 at 15:33 • Filed to: None | 0
| 10 |
So, I was doing some routine maintenance on my Land Cruiser yesterday and started off with plugs and wires. I like to do a compression test while I have the plugs out so I started with cylinder 1 and worked my way back. Factory spec compression for the F engine is 150 psi
Cylinder 1 - 133 - a little low but hey the engine is 45 years old you expect a little gas to leak out once and a while. Kind of like when we humans get old!
Cylninder 2 - 110 - not liking this, but almost within acceptable deviation. Maybe time for a valve job
Cylinders 3-5 - 125 - nice, its consistent. Not looking forward to the valve job but it looks like it won't be too bad.
Cylinder 6 - 55 - Aww crap, that valve job is looking pretty good right now, probably need to change the head gasket now.
Think my assumptions were confirmed when I opened the oil filler cap and saw this:
Now I just need to decide if I should do it now or wait until our garage is built and I can do it inside and just drive the truck locally for now.
His Stigness
> GRawesome
10/20/2013 at 15:44 |
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Cylinders 1 3 4 and 5 are all good relatively speaking, and if I remember correctly they should be within 10%.
Could you tell if cylinder 6 was leaking from the exhaust side, intake side, or through the rings? The same question goes for cylinder 2.
And what the hell is all over the oil cap? I'm not too well versed on older engines, I specialize in much newer, very German cars.
505Turbeaux
> GRawesome
10/20/2013 at 15:47 |
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Valve job might not be needed, but you are going to have to pull the head to do the head gasket, so why not. That milkshake is a 90% sure sign it is popped
desertdog5051
> His Stigness
10/20/2013 at 15:50 |
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Moisture in the oil turns it that color.
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GRawesome
> His Stigness
10/20/2013 at 16:05 |
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Like Desertdog said, it's moisture in the oil that causes that particular sludge. On these old trucks it can be caused by condensation in the fuel line or driving the truck before the engine is warm. But combined with the really low compression in #6 I figured it was a head gasket. I didn't do a wet compression afterwards to see if it was valves or rings since I saw all that sludge, but I will probably do one next weekend for peace of mind.
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GRawesome
> 505Turbeaux
10/20/2013 at 16:08 |
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Yeah, if I do the head gasket I'll definitely do the valves while I'm at it. Originally I thought it would just need the valves, but when I saw #6 and the sludge I was wishing it was just a valve job.
wacopalypsenow
> GRawesome
10/20/2013 at 20:52 |
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Do you use Mobile 1 oil?
Edit: My reason for asking isn't cynical or stupid (maybe)?
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GRawesome
> wacopalypsenow
10/21/2013 at 15:09 |
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This was my first oil change since getting the car, so I'm not sure what the PO used. I was going to use Valvoline VR1 for its high zinc content, but once I saw that I probably needed a new head gasket I stopped after doing the plugs and wires.
Why do you ask?
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wacopalypsenow
> GRawesome
10/21/2013 at 16:34 |
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Mobile 1 0-w40 (Euro car formula) cakes up like that (a lot less, just goop on my cap) in my Mercedes and my head gasket is fine. Not saying there is 0% moisture leaking, but I'm saying that Mobil 1 seems to make that exact color and consistence.
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GRawesome
> wacopalypsenow
10/21/2013 at 16:40 |
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Thanks I'll look into it. There is no way to tell what kind of oil was in there, but I could change the oil and see if the problem persists. That still doesn't solve the low compression issue, but that could still just be a bad valve. I'm going to try a wet test soon and see if that helps at all and then go from there.
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wacopalypsenow
> GRawesome
10/21/2013 at 19:26 |
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Right on, #6 is off the charts