I purchased a 1980 Toyota HJ45 with the 3.9L six cylinder H diesel. The previous owner told me the engine needed rebuilt because compression was 35% lower on one of the cylinders. It turns out that the engine was pretty well sludged up due to operating with a faulty (stuck open) thermostat. The engine never got up to normal operating temperature and was run at idle for long periods of time.
A leakdown test confirmed the bad cylinder was losing pressure past the rings.
I've cured the compression problems with a few overnight Seafoam soaks. Now compression is uniform and high in the specified range on all cylinders. The problem is the thing smokes horribly until it's up to temp. After replacing the thermostate, valve seals, rebuilding the injectors and ruling out all of the other common causes of unburned diesel smoke I finally decided to drop the oil pan to visually inspect the cylinder walls. They are all glazed.
I'm planning to ARX the engine now that it's running well. Before I do I was wondering if it will help deglaze the cylinder walls? I'm considering pulling the head, dropping the crank and honing the cylinders but would rather not if ARX might provide some help in this area.
Any insight would be greatly appreciated. I did search the forum for 'glazed' and 'glazing' but nothing came up. I apologize if this has been covered in the past.
Auto-Rx will not repair broken or damaged parts it will remove sludge and clean ring packs.
Daryl
I understand how Auto-RX works. I've read through the very helpful and extensive information on the website.
I don't consider glazed cylinder walls to be "broken parts". Maybe they are. Cylinder glazing is a varnish of oil that sticks to the cylinder walls when piston rings don't properly seal due to carbon buildup in the ring packs.
I'm interested in ARX because I think it will do a better job at cleaning my rings long-term than the quickie Seafoam treatment I did to unstick the rings. My question, before I place an order for ARX, is will it also help remove the cylinder wall glazing? (Glazing is an oil varnish.)
If glazing is an oil varnish go ahead and use auto-rx, is this glazing affecting how the car is running, usually varnish stains are cosmetic and they do not hurt anything.
Cylinder glazing will cause a diesel engine to smoke excessively until it's up to operating temperature. The glaze prevents the rings from seating properly throughout it's full combustion stroke.
Under the confines of your description, I'd say that Auto-Rx would help alleviate the problem. It should displace resident films from wherever they reside.
-- Edited by geeaea on Tuesday 23rd of June 2009 03:44:18 PM
