my 300 dollar datsun 620 project starter

[Datsun R Fun]

the truck is a 1979 620 long bed.

 

has motor, and brake issues.

 

addressing motor issues here

 

right now problems  i see and things i have done to try and change how it runs.

 

i have put new plug wires,rotor, cap,plugs on .need to do the spark plugs but when i inpected each plug looked fairly normal till i got to the cylinder nearest firewall, that plug was seroiouly correded wit what looked like black caked on oil, assume is oil foulded, wonder what is best prodcedure to diagnos why there is excessive oil in just the one cylinder ? that one cylinder is reason i have not chanaged the plugs out.

 

the other issue is rough running motor does not to seem have the same power as the 74 620 i have, would think there would be a difference if the l20b was running closer to right.

[datzenmike]

Get it running. The plug may burn the oil off and run clean ... or just change it for a new one and check it now and then to see if it is getting dirty... go from there. Could be a bad plug wire and the plug just fouled. Could be a bad intake valve seal letting in too much oil. Could be lots of things.

[Datsun R Fun]

its a 79 620 with stock l20b , when asked guy at the parts shop what the gap should be, he said .042 was proper gap, is the right  if not whats proper ?

 

and is the 1978 FSM on olddatsun.com should be applicble to the 79 still, for most part ?

[banzai510(hainz)]

plug gap is a minor issue

First I would ck the timmmgin with a light.

chANGE THE PLUGS AND GAP THEM CORRECTLY.

do the mixture setting

ck your lash pads.

 

if one cylinder is black is most like going to get black again. but unless its a reall compression loss you still can get it to run better.

[Datsun R Fun]

well changed plugs out with properly gapped plugs. took timing light checked each wire for spark, timing light flashed on all.

 

need to look in fsm and see what the timing should be set to.

 

to do the mixture settings that is bes done while motor is running ?

 

then when you say chack lash pads is that talking bout valve adjustment ?

 

learning gearhead lingo, please gimme lil more detail.

[banzai510(hainz)]

olddatsuns.com  and ck out the" How To" section on herewill get you started.

[Datsun R Fun]

all plugs where black sooty looking from my change, then had buddy look at carb he said carb was fuggered up, dumping way more gas then should(rebuildtime). we pulled carb off and it looked like there was several tsp of gas just sitting in bottom of intake below carb after a short drive.