"Nauraushaun" (nauraushaun12)
09/19/2015 at 22:02 • Filed to: WRENCHING
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"Nauraushaun" (nauraushaun12)
09/19/2015 at 22:02 • Filed to: WRENCHING | 1
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Those of you who follow my posts (all 1 of you) know that my !!!error: Indecipherable SUB-paragraph formatting!!! has a !!!error: Indecipherable SUB-paragraph formatting!!! and probably a busted engine and is now worthless. But what if it could be fixed?
That’s right. I actually had a friend of mine who’s a mechanic look at it back when the proverbial shit hit the fan. The symptoms (loss of compression under no load) suggested timing belt, but he couldn’t get one of the timing belt covers off due to lack of tools. His head wasn’t really in it.
But another friend of mine has insisted that we give it another look. He’s an awesome guy with a VT Commodore and an 80s Corolla he’s drivetrain swapped a number of times, so if anyone can help it’s probably him (or I could pay someone, but that costs money right?).
An intact timing belt. Hoorah!
And help he did. After a few hours removing bits and pieces to get the other timing belt cover off, we found that the belt isn’t snapped and timing still seems to be good (timed? correct? I dunno, I’m learning). It looks like the culprit is the crank angle sensor, so we’re gunna start replacing things and hopefully in a couple of weeks we’ll fire it up and all will be right with the world.
The aforementioned bits and pieces
Until that happens...the weather’s improving sharply as Austalia comes out of Winter, we’re having a good time wrenching on the Z and cruising around in !!!error: Indecipherable SUB-paragraph formatting!!! when we need tools/parts. Things could be worse.
DrJohannVegas
> Nauraushaun
09/19/2015 at 22:05 |
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Compression and your crank angle sensor have zero relationship. Do a proper compression test.
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Nauraushaun
> DrJohannVegas
09/19/2015 at 22:14 |
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Unfortunately we’re in the midst of the timing belt swap now. My options have been limited with the damn thing stuck in my car port.
We’ll get our way out of this and re-evaluate :)
That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms
> Nauraushaun
09/19/2015 at 22:16 |
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What do you mean by loss of compression under no load? You’ve either got compression or you don’t.
If the belt is intact, I suppose it could have stretched and jumped a few teeth.
What happened to it to begin with?
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Nauraushaun
> That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms
09/19/2015 at 22:30 |
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It looks perfect. Aged, as you’d expect since it’s right about now it should be swapped. But it doesn’t look busted in any way. And everything seems to be in time. It could have stretched I suppose, we probably wouldn’t have picked up on that.
I mean that I lost compression while the car was not under load, contrast to losing compression under hard acceleration which would be more likely to be the head gasket.
I described what happened in my first post, here :
I get in. Turn the key. It starts. Revs go up. Revs go down, to 0. Stall. Not in gear, shouldn’t be stalling.
Try again. Cranks, but that’s it. Cranking much faster than usual.
Any advice would be appreciated :)
BlazinAce - Doctor of Internal Combustion
> Nauraushaun
09/19/2015 at 22:37 |
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Warm weather, wrenching and cruising? That’s the life man!
traitor joe
> Nauraushaun
09/19/2015 at 23:45 |
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I agree, your symptoms are not enough of a basis to conclude a loss of compression. Test compression, fuel, and spark. You will have your answer..
DogonCrook
> Nauraushaun
09/20/2015 at 01:14 |
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Worst case scenario that’s the best hopped tooth event you can have. But I doubt that’s what happened.
Going through general fuel/spark trouble shooting will probably get you back on the road. But you would probably hear a valve contact, And the easiest compression test is rule of thumb. If you can’t hold your thumb over the spark plug socket while cranking it’s enough for combustion, if you can it’s no bueno.
Edit: and buy a vac test kit. The Google how to diagnose an engine with one. It’s a dying art but being able to interpret it correctly is the best way to diagnose internal problems wirhout pulling everything apart. With a 20 dollar vac gauge figuring out if it’s timing, a head gasket, rings, or a valve is simple. I doubt you have any of those issues, but it’s nice to be able to rule them out.
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That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms
> Nauraushaun
09/20/2015 at 07:44 |
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Does it catch at all when you crank it? Like an occasional sputter, or just nothing at all?
Turning over faster than usual says no compression to me, but it’s odd that it happened the way it did...not under hard acceleration or even driving.
I’d run a proper compression test on it and see what you’ve got. Blown head gasket doesn’t seem likely, since you’re probably only going to lose 1-2 cylinders and it should still run assuming its blown between cylinders.
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Nauraushaun
> That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms
09/20/2015 at 23:24 |
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It didn’t seem to catch at all. The rate of turning over would flutter up and down a little, but it wasn’t catching at all.
If/when we get it back together and it doesn’t work, I’ll follow up with a compression test.
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Nauraushaun
> DogonCrook
09/20/2015 at 23:28 |
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Yeah, I will. You’re right, proper diagnosis may have saved us a lot of time. We may have blamed the timing belt since it’s right on the cusp of needing it changed.
For what it’s worth, we have done a basic test of fuel and spark and those alone aren’t the issue.
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Nauraushaun
> traitor joe
09/20/2015 at 23:28 |
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We have done a basic test of fuel and spark (on one coil pack only). But you’re right, we probably jumped to a conclusion without fully testing.
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Nauraushaun
> BlazinAce - Doctor of Internal Combustion
09/20/2015 at 23:29 |
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Thanks, agreed! I think you’re the only commenter who has picked up on this angle :)
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BlazinAce - Doctor of Internal Combustion
> Nauraushaun
09/21/2015 at 20:36 |
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Hahaha, it’s probably because here in Brazil we’re under heavy rain, in the middle of university exams and with no time to wrench... I just got out of one such exam and... I feel violated, man!
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Nauraushaun
> BlazinAce - Doctor of Internal Combustion
09/21/2015 at 22:59 |
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Like I said, we’re just coming out of a cold dead Winter. Having the weather finally good enough that you
want
to go outside is awesome, and on a weekend no less!
CalzoneGolem
> Nauraushaun
10/13/2015 at 07:50 |
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This is making my eyes itch.
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Nauraushaun
> CalzoneGolem
10/13/2015 at 08:25 |
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Very much looking forward to driving it out of that car port and cleaning the shit out of it