Valve job question on LD28

Discuss (and cuss) the Nissan LD-series OHC Six diesel engine, popularly available in the US in 1981-83 Datsun/Nissan Maxima Sedans & Wagons.

Moderators: plenzen, glenlloyd, goglio704, Nissan_Ranger

Post Reply
JasperG
Posts: 95
Joined: 16 years ago
Location: Bradenton, FL

Valve job question on LD28

#1

Post by JasperG »

Getting ready to freshen up the LD28 I bought for my project rover. It runs but the previous owner suggested I remove the head and have it checked and re ring it as it smoked a bit. Ive decided to just rebuild the head. I found the rings on ebay and also found the intake and exhaust valves. I guess I need the valve seats, guides and seals now, but Im not sure what else I might need (other than gaskets which I believe I have lined up). Rockauto has the valve guides, and seals, but Im not sure if they have the right seats. Anyone know if this is just for the exhaust? Its the only seat they list. Seems a bit pricey too.
SEALED POWER Part # 245143761 More Info
Diesel engine; Loc. Exh., 1.4445" OD, 1.162" ID, 0.31" Depth

$12.19 $0.00 $12.19
anyone know if these parts are easily to get locally, say napa? Thanks Gordon.
User avatar
asavage
Site Admin
Posts: 5452
Joined: 19 years ago
Location: Oak Harbor, Wash.
Has thanked: 2 times
Been thanked: 3 times
Contact:

#2

Post by asavage »

Valve seats are almost never replaced on alloy heads during a rebuild.

Unless you have a lot of stem wear, you won't need to replace the valves either. The LD28 lubes the head really well. I'll be interested in what you find for stem wear. And guide wear. Measuring guide wear does require specialized equipment, and reaming the new guides (if you elect to replace them) will require a reamer of the correct size. Expensive stuff, if you're only going to rebuild one head. You might farm out some of this measuring etc. to a shop.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
JasperG
Posts: 95
Joined: 16 years ago
Location: Bradenton, FL

#3

Post by JasperG »

Thanks much. I decided to wait on the valve seats until the machine shop has a look at them. The previous owner said it was smoking a bit and recommended taking the head in and doing rings. I just figured I would change the valves and guides while i was at it as well as the seals and whatever else needed attention. The guides and valves together were just over 50 bucks so I figured it was worth doing, might be overkill though, I know. Thanks for the advice!
JasperG
Posts: 95
Joined: 16 years ago
Location: Bradenton, FL

#4

Post by JasperG »

Hey I wanted to reply to this and let you know that I got a used head off this board. I did the basic tests per the FSM and to my surprise the head was in excellent condition and didnt require a rebuild. I lapped the valves, cleaned everything up and got it back together. Thanks for the help
Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest