• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail
    Owner/Operator

Sd33/Sd33t

1980ST

New member
I just recently bought a 1980 diesel traveler, the body tag under the hood reads "engine family sd33t" the numbers from the front left side of the block read "sd33-######" . My question is, is this a transplant engine or possibly the original. Manifolds are not turbo equipped manifolds.
 

ihpartsjeff

Administrator & Owner
Staff member
Moved to the correct area. Please take a moment to better understand our website as this is the second time I have moved one of your postings.

All 1980's had the turbo while the earlier years did not. If the engine does not have a turbo on it then it is not the original engine.
 

1980ST

New member
Um I'm sorry. The forum said have a question for Isa ask it here, so I did, maybe its the site, I thought I was posting in the correct location.
 

1980ST

New member
I've read some things about putting a turbo on a non turbo sd and some people say that to keep the engine safe you have to replace some inner seals and even saw some say pistons too, is this true? Aside from manifolds what is necessary to complete this conversion?
 

Carl Wiese

Member
I've read some things about putting a turbo on a non turbo sd and some people say that to keep the engine safe you have to replace some inner seals and even saw some say pistons too, is this true? Aside from manifolds what is necessary to complete this conversion?
If there is no turbo it is not the original engine. All 1980's Scout II's were turbo engines. You can convert a none turbo engine to turbo, simply by finding a turbo intake and exhaust with the turbo and bolting it on or making your own.

However, this is not recommended. The turbo motors have an upgraded cooling system and it has oil squirters in the block to cool the bottom side of the pistons. The pistons are different, they have 5 rings instead of 3 and the top ring grove in armored.
 

1980ST

New member
Thank you for the info it is much appreciated. What is your personal take on doing this, (turbo-ing a non turbo) have you herd of people blowing blocks and or melting pistons after the mod? What is the probability of harm coming to the engine, moderate risk or low risk? I've read that its a low risk but I don't want to take any chances without proper research, I plan on using this rig as a daily driver and hunting vehicle.(michigan) thanks for your time, tb.
 

Carl Wiese

Member
thank you for the info it is much appreciated. What is your personal take on doing this, (turbo-ing a non turbo) have you herd of people blowing blocks and or melting pistons after the mod? What is the probability of harm coming to the engine, moderate risk or low risk? I've read that its a low risk but I don't want to take any chances without proper research, I plan on using this rig as a daily driver and hunting vehicle.(michigan) thanks for your time, tb.
In my opinion you are builsing your engine to fail. Your going to invest in failure. It is not a matter of if you are going to crack pistons but when. Part of having a diesel is reliability and longevity and putting a turbo on the engine takes away both of those.

Also there is no fuel compensation on the injector pump so anytime your boosting the engine will run lean, which means more heat. All around a bad idea.
 

1980ST

New member
Thank you for the tips, it sounds as tho I would be better off just saving my money and running this engine until I can afford an old original turbo engine. Any idea on the cost of such an engine? What is the bolt pattern for lugs on an IH, 5-4?
 

Carl Wiese

Member
thank you for the tips, it sounds as tho I would be better off just saving my money and running this engine until I can afford an old original turbo engine. Any idea on the cost of such an engine? What is the bolt pattern for lugs on an IH, 5-4?
It's not often the running sd33t's come up, but I'd expect to pay 1500-2500 for one depending on miles. I'd also make sure to hear and see it run before I bought it, and do a cold start on it.

Lugs are 5 on 5.5"
 

1980ST

New member
Haha, I called and talked to the Super Scout Specialists out of ohio just yesterday about an sd turbo and he quoted me, on one that has ring problems and needs to be rebuilt, at 1000$. Found some steel rims locally yesterday as well, said to be original chrome rally's in fair condition.
 

ihpartsjeff

Administrator & Owner
Staff member
haha, I called and talked to the Super Scout Specialists out of ohio just yesterday about an sd turbo and he quoted me, on one that has ring problems and needs to be rebuilt, at 1000$. Found some steel rims locally yesterday as well, said to be original chrome rally's in fair condition.
I wouldn't laugh as $1000 is what the cores are worth these days. We have them too if you want a rebuildable core. Otherwise keep looking as they are hard to come by for a reason. Reman sd-33 engines sell for over $6000 these days.
 

1980ST

New member
Its not so much the price I was concerned about but rather the fact that they don't know exactly what the problem or problems are. It would be one thing to purchase a remand engine but to put a grand down on something thats broken and I have to fix not knowing all the issues or potential issues that would arise, thats an issue for me. Its good to know the remand price tho I was ball-parking around 5g. What is the cost of the complete rebuild kit? And when you say "core" is that complete engine; manifolds, intake, turbo the whole shot, or just the block?
 
When putting a turbo on a non turbo engine don't you have to raise deck height to lower compression ?
I know in gas motors that's vital so as not to melt pistons and such
 

Hondo

Member
Any quick way to check if he's got a turbo motor, but a po had problems with the turbo and chucked it ?
 

Michael Dimock

IH Parts America Sales Assoc.
For a diesel, no compression changes are required until you start to get way up in the boost range. More fuel = hotter, less = cooler. You can't run a diesel "lean" per se. If the amount of fuel the injection pump is putting out remains the same your engine will run cooler with the addition of a turbo than without. Factory turbo engines are always upgraded in some form or fashion to handle the additional power output as normally there is more fuel added to coincide with the increase in air. Hope this helps a little.
 

RMP&O

New member
if there is no turbo it is not the original engine. All 1980's Scout II's were turbo engines. You can convert a none turbo engine to turbo, simply by finding a turbo intake and exhaust with the turbo and bolting it on or making your own.

However, this is not recommended. The turbo motors have an upgraded cooling system and it has oil squirters in the block to cool the bottom side of the pistons. The pistons are different, they have 5 rings instead of 3 and the top ring grove in armored.
Spot on.

Few other differences too. I just about done turbo'ing an 1983 n/a sd33 from a german patrol.

Injection pump is different. Turbo version has governor on it for boost. Turbo head will have steam ports.

The 83 n/a we just used did have the oil jets on the pistons. So by 1983 at least for the european market Nissan had streamlined the blocks and were no longer using two different blocks. Ie, turbo block on the n/a and all Nissan was producing at this time. I am also using a new from Nissan head, bought by a previous owner back in the late 90's. It lacks the steam ports so the heads did remain different until the end of the sd33t's. Easy to drill the n/a head though which is what we did.

Cheers
 
Top