

| Subject: | Re: off with her heads |
| From: | Jim Felder |
| Date: | Thu, 24 Oct 2013 16:05:49 -0500 |
And here I had been thinking you had invested in some autocorrect technology : ) Jim On Thu, Oct 24, 2013 at 4:02 PM, Scott Daniel <scottdaniel@turbovans.com>wrote: > I have always been very speeling challenged ! > > > On 10/24/2013 1:43 PM, Jim Felder wrote: > > No, "barring." Baring might get him arrested, especially if he were driving > around doing it in a Vanagon. > > Jim > > > On Thu, Oct 24, 2013 at 3:31 PM, Scott Daniel <scottdaniel@turbovans.com> <scottdaniel@turbovans.com>wrote: > > > HI Angus .. > on the 'bar thing'..yeah, Angus turned me onto what you meant. > The word you wanted was 'baring' . > > On the rings ..I find that compression rings go in fairly easily .. > it's the oil rings that are a tight squeeze sometimes. > > One way to gauge piston ring and barrel wear is to remove an old ring > from that piston, > put it in the barrel and measure the end gap of the ring, then compare > that to spec. > > You'll likely find pretty 'good' wear. > > I forget how many miles on your engine .. > and it's always .."Do I just fix what's really broken or worn badly ? .. > or do I go further ? > And ....once you do 'this' ..then might as well do 'that' too .. > and it just keeps growing that way. > > Need to draw the line somewhere .. > it's tempting to do new rings and rod bearings ... > but then you might as well do X too ...........etc. etc. etc. > > yes, the right forward cylinder is # 1 . > VW has used that numbering pattern in their oppossed fours since about > 1950, if not before that even. > > here's a neat trick .. > when you are adjusting your valves, turn the engine backwards to get to > each cylinder on compression in turn ... > that it's 1, 2, 3 , 4 . Confirm which cylinder you are on by dist > rotor position . > > If anyone is interested in rebuildable 1.9 core waterboxer engines ....I > have about 6 and don't want much for an assembled short block. > You can make a 1.9 DH code engine into 2.1 by putting a 2.1 crankshaft > in it. > > Scott > > > > > > On 10/24/2013 8:08 AM, Tom Carchrae wrote: > > > @Scott: > > Thanks for confirming about the valves. I'm not entirely sure which ring > it is, I'll go and have a closer look today. Btw, I didn't adjust > anything > with a bar - bar was meant as a synonym for 'except'. I am pretty sure it > is cylinder #1 (it is the closest to the passenger seat). > > > @Dennis; > > > On Wed, Oct 23, 2013 at 10:50 PM, Dennis Haynes <d23haynes57@hotmail.com> <d23haynes57@hotmail.com> > > **wrote: > > Please take this as training. > > I do take it that way - mistakes are the best teacher, so they say?.... > but > still enjoying learning and working on it. > > I also very much appreciative of all the time and insight you, and others, > on the list are so generous with. > > > > At the point that compression test was taken > > that engine should have been taken out of service and further evaluated. > All > the cylinders are down and the one with 60 psi indicates a failure. If > you > had an emissions test program it should have failed. The catalyst is most > likely shot. More concerning is while that cylinder was down the > remaining > three had to work harder to compensate. > > > That is the strange part - it passed the emissions test fine, not even > close to failing. The mechanic who did the compression test also thought > it would be a problem. So, I don't understand how that works, except > perhaps that Vancouver's AirCare is a farce - one that they are ceasing to > operate next year. > > > > This often translate to increased > > wear on the rod bearings. The oil contamination from unburned fuel > doesn't > help things. Before taking the engine a part a leak down test would help > to > diagnose if you had a valve or a ring problem. > > This is was my most expensive lesson. I took it to a mechanic, and > > asked > him to do a leak down test, and to look at the compression problem. He > reported back that he had got the compression back up by adding racing > lash > caps. I recall asking him about the leak down, and got back 'fine', and > 'it holds pressure', and so on. It is clear from what you're saying that > I > should replace the valve adjusting screws, not just pad them with lash > caps. > > Shortly after that, he changed the expansion cap, and I started to get a > really expensive series of coolant explosions. Then I drove the van > across > western canada, with a few incidents, although after I changed the > pressure > cap to another one I didn't have any more explosions - just coolant backup > behind the plate, and it was fine for an entire leg of the journey home. > Each experience made me want to fix it myself more - the last incident > was > taken care of while we stopped for lunch (the first involved a tow truck, > waiting around for a day, and a crappy patch on a hose). > > Anyway, all that is now water under the... no, coolant under the van? har > har. sorry, sorry... groan-worthy. > > > > Now that the heads are off there are some easy checks you can make. Put > > the > spark plugs in and set the heads with the combustion chambers facing up. > Fill the chambers with some light liquid like WD-40 or even carb cleaner. > You will find leaking valves real fast. > > > Thanks. I'll give that a shot before I dig further into the valves. I > saw > a video of someone doing that, but it was on a different type of engine. > > > > The exhausts should not be ground. > > If the seat are cut or the valves ground the stems should be shortened > and > the springs shimmed to compensate. This is to maintain spring pressure > and > rocker geometry. Adjusting screws should always be replaced. If the valve > guides are worn it is likely time for new heads. These are a heat the > head > to 400 and cool the guides in liquid nitrogen fit. Otherwise they tend to > go > in off center and the seats will need a lot of cutting to compensate. > > > ...and I though the spring tool was going to be fiddly. > > They are newish AMC heads, no pitting (aside from some crowbar scratches). > I think they were done 5-10 years ago according to the receipts log, but > I'm not sure both sides were done at the same time. I've read the bit > about the AMC valves being terrible. I'll do some more reading up on how > to check those (aside from WD-40 test) > > > Back > > > when VW rebuilt these heads they almost always ended up drilled out and > fitted with oversized guides. A lot of labor. Make sure the intakes get > the > oil seals. ETKA does not show them but they should be there. I have a > bunch > in stock. They will keep oil from getting sucked down the intake guides. > > and that would help prevent the valves and cylinder getting filthier? > > > > You need to remove that carbon ridge at the top of the cylinder. The new > top > > > ring can get broken hitting it. If honing the cylinders remove as little > material as possible. A few more thousandths and you will have an engine > with piston slap noises. With the cylinders out at least measure the rods > for play and bearing wear. The rods and bearings can be replaced without > splitting the case, (this sucks but do-able). > > I've been reluctant to pull any more cylinders out until I try getting > > one > back on. > > > Good luck, > > > Dennis > > > Thanks Dennis - very much appreciated. > > Tom > > > > >
Have something to add on this topic today? Revive this thread in the forum »