6 cylinder lark questions

[drnittler]

Some questions for my 61 Lark 6 engine (I know these have been asked a lot but...)
1. The corect weight for oil in TX is?
2. The head, valves, etc and all have be done professionally. The head bolted to the block correctly, and there was a pin hole leak at the head gasket, I have had the head reinstalled twice, so what is left to do? I did add BARS Stop Leak and I am waiting to see if this helps (The leak is not constant just slight and sometimes). The head has been retorqued.(Repaired valves solved a llot of blow by issues) NO funny somke from the tail pipe, oil is oil and anti freeze is normal. A slight bit of sludge in the oil cap.
3. A slight knocking for a minute, usually when real cold, or from non use. The oil I have been using is 20W 50. Can this be a cause? This knocking just started. I rebuilt the engine 10 years ago and there is 3000 on the rebuild.
4. Plugs are all showing ok # 5 and 6 a little carbon on them, what is this?
Your help is appreciated?
Thanks.

David G. Nittler

[Guest]

David - When the head was torqued down, did the tech/mechanic follow the tightening sequence?
Also, was the head checked for a possible warp originally? My machine shop is adamant about checking surfaces.

[StudeRich]

If the plugs have DRY carbon not wet, it is Fuel -too rich.

Some of these OHV 6's mostly '63-'64 ORIGINALLY have, had terrible Carbs. that are hard to lean down, and make run well. But unless changed your '61 would have had a slightly better type AS Carter one barrel. The bad ones are model RBS Carter.

20W-50 Oil in Texas, should be fine, if you add ZDDPlus additive for the ZDDP needed in today's oils, or use Castrol Syntec 20W-50 full Synthetic Oil. [^]

Was a good Permatex non-silicone gasket sealer used on the head Gasket?

You MAY have a timing (Cam) gear "knock".

StudeRich

[buddymander]

If you want to isolate the knock from the crank, put some thin oil in the engine and warm it real good and then drop the idle as far as it will go and see if your needle starts to fluctuate in time with the knock.

[drnittler]

Head torque and sequence followed.
20 W 50 ok with zink.??
I have the 61 AS carb
Probably is too rich.
Used a copper type headgasket sealant.
Thanks

David G. Nittler

[jackb]

FWIW...a friend has an original 61' OHV 6..never touched. He has a pin leak at the head that is intermittant and never really allows for that much loss. ~80K miles. Runs nice and smooth. I think we expect too much from these 50 yo beasts sometime....on the other hand, a rebuilt engine should have been measured before re-assembly.

[StudeRich]

quote:Originally posted by drnittler

20 W 50 ok with zink.??

Repeat Quote: "20W-50 Oil in Texas, should be fine, if you add ZDDPlus additive for the ZDDP needed in today's oils, or use Castrol Syntec 20W-50 full Synthetic Oil."

Nuff said?


StudeRich

[drnittler]

Update I fired up the car, nothing weird. It knows I contacted SDC! (I threatened to sell it and keep my son's 50 Ford!!!)

David G. Nittler

[drnittler]

Update I fired up the car, nothing weird. It knows I contacted SDC! (I threatened to sell it and keep my son's 50 Ford!!!)

David G. Nittler