exhaust coming out of one intake hole

SD diesels were widely available in the US in the 1981-86 Datsun/Nissan 720 pickups, and in Canada through '87 in the D21 pickup.

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jeff115
Posts: 19
Joined: 11 years ago
Location: utah

exhaust coming out of one intake hole

#1

Post by jeff115 »

I just got my sd22 installed in a mazda b2000 truck :D it used to run fine but when I got it fired up its not.... there is exhaust coming out of the #1 intake valve :x pulled the head and the valves look fine, I have never seen this problem before. any body have an answer for me?
datsun sd22
Modsqwad
Posts: 8
Joined: 9 years ago
Location: Victoria BC

#2

Post by Modsqwad »

Did you check the valve timing before you pulled the head? Broken valve spring? Tight valves? Just throwing out some ideas,you've probably covered already. Let us know how it turns out.
Andy
plenzen
Posts: 869
Joined: 14 years ago
Location: Cochrane Alberta Canada

#3

Post by plenzen »

Stuck rings ?
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN
jeff115
Posts: 19
Joined: 11 years ago
Location: utah

#4

Post by jeff115 »

timing cant be off because nothing changed. valve looks good, closes all the way. valve springs are in good shape. I cant figure it out or find any replacement parts. any one have a spare head laying around?
datsun sd22
plenzen
Posts: 869
Joined: 14 years ago
Location: Cochrane Alberta Canada

#5

Post by plenzen »

Actually remove the valves from that cylinder and have a look.
The valve may looked closed but may not be seated correctly.
The seat may be damaged or there may be something stuck under it and prevent it from closing completely.

Paul
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN
jeff115
Posts: 19
Joined: 11 years ago
Location: utah

#6

Post by jeff115 »

well some one had to have taken the rocker assembly off at some point while it was sitting the shop because 2 push rods were not seated in the lifters. got them in correctly and it runs smooth again!
datsun sd22
jeff115
Posts: 19
Joined: 11 years ago
Location: utah

#7

Post by jeff115 »

the rocker assembly must have been taken off at some point because two push rods were not moving. they were not in the lifter so they were just holding the valve open a hair. but its running smooth once again!
Image :D
datsun sd22
Modsqwad
Posts: 8
Joined: 9 years ago
Location: Victoria BC

#8

Post by Modsqwad »

Glad to hear it worked out. How much boost are you running?
jeff115
Posts: 19
Joined: 11 years ago
Location: utah

#9

Post by jeff115 »

I don't know yet.
datsun sd22
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