Re: LT31 1986 DW jerking at 2000-2300 rpm


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Geschrieben von emilio da roma am 25. April 2021 09:03:07:

Als Antwort auf: Re: LT31 1986 DW jerking at 2000-2300 rpm geschrieben von emilio da roma am 02. April 2021 20:49:22:

Hello dear forumers!
Here to update you about my sick DW engine, and looking for some more kind advice. Before reinstalling the pump, I made a compression test, here the bad results:

cyl. 1 -> 23 bar
cyl. 2 -> 3 bar
cyl. 3 -> 31 bar
cyl. 4 -> 29 bar
cyl. 5 -> 25 bar
cyl. 6 -> 28 bar

for sure not numbers from a fresh engine, although i did not get any death symptom at all before the strange behaviour "hiccup" i described in the first post.

the intake valve on cyl. 2 is leaking, here is the video of the last test, you can listen at my voice and a little bark of Ettore, my dachshund :)

https://www.dropbox.com/s/3jl4mcga2xiwyk1/IntakeValveCyl2Leaking.mp4?dl=0

my idea is, as a frist attempt in the sake of containing costs, to remove the head, have it replaced or refurbished and reinstall with new cambelt&coolant pump etc, in the hope that the condition of the "low" side of the engine is still acceptable. at the moment the situation is: removed intake manifold and the upper 6 copper nuts from the exhaust manifold and the upper 2 from the heat shield bolted to the right manifold. don't know how to reach most of the 6 lower nuts. Which is the best way/tool to remove them? And, once removed, are both manifolds free to be moved enough to clear the studs on the head? Can you help me? I found no useful informations on the manuals i have. Thanks in advance, as usual!
Ciao
emilio


Thaks for the advice Tiemo! For the moment I want to focus only on the "rear side" of the engine, seems like a miracle to me to have done in just one week what an experienced mechanic does in half an hour :) at least at the end of this journey i will have learned how to adjust valve clearange, how to change the rear camshaft oil seal, how to remove the ESP gear without a puller and, hopefully, install the ESP and properly set its injection timing. I know very well that the front side of the engine may hide more challenging surprises to deal with: in the meantime i get almost all the tools needed for the cambelt, missing only the500 nm torque wrench… we will see...
Hello Emilio!
I need the gear puller to remove the ESP, i oredered an universal type, hoping it will do the job!
There is no need for a gear puller to unmount the wheel of the ESP! On the contrary, this could damage the wheel.
Just do the following:
- Loosen the nut about 2 turns, to protect the shaft and to avoid flying away of the wheel, when it comes off.
- Take two big screwdrivers and, one from the left, annother from the right, push them into the gap between the wheel and the hub of the ESP as wedges, using a plastic hammer, so they are under tension.
- Then, with a metal hammer, give one blow to the nut. The wheel will jump off the joint.
Same with the front wheel of the camshaft (if necessary):
- Loosen the Screw about two turns, using a wrench and a backstop.
- Take a backing-out punch or a small metal rod (about 8mm diameter) and give it a blow by a metal hammer, setting it into the hole in the belt housing behind the wheel.
- The wheel will jump off the joint, but be kept back by the loosened screw.
Ciao,
Tiemo



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