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Valve Adjustment

Hi all. This is my first with entry/question with "oldholden.com" as a new member. As the topic I chose "Holden Info", but "Silly" may be more appropriate. My car is a Land Rover, which has a Holden 202 motor in it. I just recently had need to replace the head, and was able to find a Yella Terra which used to be a 149 type. The new head has adjustable valves, and I've used the matching rockers. My Christmas day drama was adjusting the valve lash. Info from a variety of sources (workshop manuals, engine rebuilders, friends) says to tighten an extra 1/4 to 1/2 turn, and others 3/4 to 1 turn, once zero lash is reached/found. I did the above and found the pushrods loosening off again after I'd completed the job. After about 3 redos zero lash meant no movement. I just know I have the lifters squeezed flat and everything 1/4 turn past rock bottom. I'm sure that can't be right, so if can anyone suggest the easiest was to fix the problem, would be appreciated? Also I hope all have had a Merry Christmas and I wish you all the best in the new year.

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Merry Xmas. With each piston on T D Centre,with zero movement on the push rod and the camfollower right up,as when in normal condition,turn down adjuster 1/2 to 3/4 turn only and let it alone,don;t worry about it seeming loose after. this puts the follower about in the halfway position of it's travel,which is correct. This from factory manual and 30 years or more personal experience. Cheers Don.

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Thanks very much for your input Don. Seem like I really did overdo the adjustment with the Hydraulic Valve Lifters (followers?) screwed right down and an extra 1/4 turn past that. Hopefully they will return to their normal condition after I release the adjustment nuts off. Thanks again.

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Hi mate, if it really is a 149 head that you've just put on your 202, you better have shares in a company that makes Octane Booster because you're gonna need heaps of it...your compression will be well over 11:1 which is too high for normal pump fuel...even the 98 Octane stuff will struggle....

Were the combustion chambers in the head (the indents for want of a better term) kidney shaped or round? If they were kidney shaped...the above will apply, if they were more round, you'll be OK on PULP...

HTH...Dave

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Cheers...Dave

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Hi Dave. Yes I got the same message from the engine reco bloke. Yella Terra has ground out the area at the top of the chamber and it is more rounded with a flat edge opposite the valve area. When he tested my new head, he said it was a borderline case and he could not guaintee the result, although Yella Terra would probably approve it's application. Thanks Dave.

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Well each story should have some sort of ending, and I think mine was OK. I got it all together today and kicked it over this afternoon. It ran straight up although there was a little bit of rattle from the rocker/tappet area to start with. The valve lash adjustment mustn't be too bad. Haven't had a chance to put the motor under load yet, and only have it stationary in the back yard. Wondering if anybody can tell me what pinging or detonation sounds like? I'm wondering how discernable it is and if I'd know if I had it? Anyway motor works and that's a start. Thanks Don and Dave for your input.
Cheers John

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Hi John,

Glad to hear you got it running mate...

If you can hear a tapping noise that increases and decreases with the revs, that's your lifters settling down. It can take a while for them to pump up properly and it may even take a good (but quick) rev under load to get them to settle properly. Do not keep the revs high if/when you do this...a quick blat to 4500 - 5000 in second, then push in the clutch/put it in neutral and let the motor return to idle or normal running-in revs (only do this if you can't get them to quieten ANY other way).

As for pinging/pinking, it sounds like the words (ping or pink) do...usually only happens under load or if the compression is too high. It can be almost inaudible or very loud depending on how severe it is. It can also sound like a leaky exhaust up near the flange(and vice versa).

HTH...Dave

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The rattle would have the oil settling in the lifters. Pinging is normal, and desirable within limits, as advanced ignition gives a better running motor, to test run at about 60 kmh in top gear find a reasonable hill and halfway up it tramp the accelerator, pinging has been described as sounding like a handful of gravel rattling in a tin.
The engine should ping a bit as it takes the load then as the power picks up pinging should stop. Advance/retard the dissy to achieve this. If you really want to know what pinging sounds like slap a tankful of straight unleaded in, it will just about kill your engine!
Pinging is not preignition, that is when you have a hot spot in the cylinder like carbon deposits or a sharp bit of metal somewhere in the combustion chamber, it gets red hot and preignites the fuel. You can clean the carbon out but if it is a bit of metal you have to pull the head and fix it.
A quick cleanout can be achieved by getting hold of a couple gallons of straight benzine (don't know if you can these days) and run the lot in the tank. It will soften the carbon deposits and the engine will burn them, the spark plugs will oil up real quick so you will have to be prepared to clean them! Also the fumes are a bit toxic so do it out in the open and don't breathe the fumes if you can avoid it. They are supposed to cause cancer but I don't know what would rate as "dangerous"
Another method is to get some hydrogen peroxide, easy from the chemist, hook a tube into the vacuum intake of the engine, drop into the bottle, and run the engine revving up and down till it uses the peroxide all up. You might a couple of bottles. The peroxide conmbines with the carbon and burns out. You will see black crap coming out the exhaust, when it stops, it's clean. Once again the plugs will probably need attention. You might want to put old plugs in to do this.

johnperth

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What dose Pinging sound like????
In short..... You'll know it when you hear it! Its a hideous, evil sounding cacophony. A sound you'll NEVER forget.

(the nightmares still plague me, But I'm getting better now)
;)
Hand built Hot Rods win kudos in my book any day!

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Hand built Hot Rods win kudos in my book any day!

Anybody tried "Prozone Fuelsaver"?

JD

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I've had a couple of customers cars with the "log" on them.They came in when the engines developed a miss. (both owners were changing plugs every 100k's or so)we tracked it down to the Prozone doova-took it off and the motors stopped gumming up plugs. I even borrowed one and put it on the old tunna-after a week it dropped cylinders-the old girl drove for ages without plug changes!

On the other side,I have customers swearing by them-it may be a quality controll deal with them.

Redbeard

Stomp-n-Steer

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Redbeard

Stomp-n-Steer
Redbeards Weirdo Shed
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