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1Y Timing after head rebuild - any suggestions

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Chappy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 19 at 08:08


thanks - that’s reassuring. Didn’t get a chance last night to run it, so will have another crack tonight.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaber Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 19 at 20:15
Fwiw it did run fairly quiet with no smoke the head that is before I removed engine

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 19 at 15:38


Update! 

It’s settled down a bit now after being run for a while at idle and allowing it to warm up.

Timing has been checked and rechecked.

Starts much better, much quieter.

Still very smoky though, and it hunts at idle which requires the idle to be turned up a little to prevent it.






Edited by Chappy - 23 Mar 19 at 15:38
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 19 at 15:53

I have another set of injectors and a pump, so I could go for a swap out I guess.

Edited by Chappy - 23 Mar 19 at 16:12
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 01 Apr 19 at 20:42




Grrrrrr....still got issues.

Hard to start - idles well when started though, but smoking excessively.


Injectors changed, but it's the same. Timing has been set three times over now using the prescribed locking methods (TDC on bellhousing/clutch - with physical verification of number 1 piston at top of stroke; pump locked with pin through pulley into pump body; camshaft plate installed) then pump timing adjusted with a DTI (to 35 thou).

There's no way it should be that hard to start and it ran very well before the head issue so I suspect something else is amiss.

Compression test planned for this week.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote danstervan Quote  Post ReplyReply Direct Link To This Post Posted: 01 Apr 19 at 22:18
Have you checked all glow plugs are working and that they are getting power to them?
IDI engines need glow plugs to start quickly and cleanly.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 01 Apr 19 at 22:25


Yep, all new were installed - it tested them all before installation just in case; and I've checked each one in operation with a multimeter.

I suppose I could pop the injectors out and take a quick look for absolute certainly.

They'll have to come out for the compression test anyway.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ob1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 19 at 07:20
Was piston pertrusion measured? Correct head gasket fitted and or was the head skimmed?

I’m thinking there’s an issue with compression and or valve piston contact. And engine can turn over by hand on but just make contact when running IME anyway!  Heat and the momentum of pistons.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 19 at 07:41

Three notch head gasket was used based on piston protrusion.

The head wasn’t skimmed - it was examined and was in serviceable condition.

I’m of the same mind OB - I think there is something more fundamental amiss.

I’ll report back once the compression test is done.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 912 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 19 at 10:19
Head was visually inspected? Was it pressure tested ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 19 at 17:48

Just got back to this today - been working on the Florida for a bit, and work travel is getting in the way.

So - negative 912: head wasn’t pressure tested, but came from a serviceable engine and had a thorough visual inspection. It was intended as a temp ‘get us going’ measure while we sourced and prepped another engine for installation later in the year.  I’ve never really been content with the turbo’d on a 1Y combo that it came with. Although I have to admit it did run very well before the damage to the glowplug boss.

Compression test shows all cylinders @ 400 PSI/28bar, give or take a few PSI with little variation between cylinders.

Bear in mind that the motor is cold though. Pressure builds up consistently over 3 strokes, so I suspect some position ring wear, but would expect it to improve when the motor is warm, and as said previously - it ran and started really well before the damage to the head.

I’m stumped 🤔 

I want to change the pump, but it seems illogical that the pump may have experienced some sort of mystery issue while the head was off and the replacement was being sourced.






Edited by Chappy - 13 Apr 19 at 17:49
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 912 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 19 at 19:10
How long was the head off, were the injectors or pump left without fuel in?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chappy Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 19 at 19:18
I’d say about 4 weeks 912.

Injectors were with me so kept sealed and wrapped after removal. Plenty of smelly stuff in them when I reinstalled.

Pump - I’m not sure. The van wasn’t with me when the head was removed and the pump remained with the block in the van.

I did swap injectors out for a set of injectors that I had of the same part number, and there was no change. Still hard to start and smoking.





Edited by Chappy - 13 Apr 19 at 21:53
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Post Options Post Options   Thanks (0) Thanks(0)   Quote danstervan Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 19 at 23:26
So reading back through some posts.
The start of the thread states the head was changed out because the owner damaged the original head when removing a glowplug. So there was a starting issue back then?
Is this 1Y running a turbo? Has the original non-turbo 1Y injection pump been played around with to provide more fuel for the turbo conversion? A lack of boost issue might explain the smoke.
Plenty known to be good fuel in tank?
Fuel filter changed?
Banjo bolts for fuel lines on injection pump in correct place with decent copper washers to provide good sealing to prevent fuel or air leaks?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaber Quote  Post ReplyReply Direct Link To This Post Posted: 15 Apr 19 at 19:37
Stick the pump that was on the engine I sent you, it ran sweet as a nut, non turbo etc

Steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mrhutch Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 19 at 10:10
change the pump chap..

A few years ago Scotty changed the HG on his JX, I was there, pump safely stored, clean etc...  for some reason when it was put back on it wouldn't start without a tow!
T3 1981 Westy Vanagon - thinks lubricant is a fuel
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