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Looking for early 4020 head bolts part #

J

jd40203020

Member
I am having some trouble with my dealer not being able to find the correct head bolt kit for my 4020. It is a 64 with the big injectors. Head casting # R33250. I was hoping to get the newer torque and turn style bolts, but they say they are not available for this head. Is this true or does anyone have some part numbers to point me in the right direction? Thank you!
 

What is your tractors block casting #?
mvphoto14474.png
 
R33180. Are the part numbers you listed
the original bolts with washers? Just to
make sure, do the new torque and turn bolts
have the flanged heads with no washers?
Hoping I get the right stuff!
 
I think washers are the old style reusable bolts and if no washer it is the torque to yeild bolts. I like the idea of not re-torquing bolts but my machine shop just told me he does not like them as he claims they overtorqe the outside bolts due to the fire ring crush on the head gasket. He says that with a few hours the inside bolts are to loose. He even had a few that on tear down the center bolts were only a little more than finger tight. First I ever heard of it but he does lots of Deere engines. Tom
 
First I've heard of this... everyone I have talked to has said to change to the new bolts. This site has a wealth of knowledge... what's everyone's oppinion?
 
You can put the later bolts in if you wish to and spend the extra money if you wish, But do not torque the newer bolt to their potential/capacity as the block is not designed to take this stress load the bolt can provide. This is why they do not provide the better/different bolt because that doesn't allow or indicate you to over torque them to their capacity. You will ruin the block if you do. The block threads is the limiting factor not the bolt. You will still need to follow the torque limit and procedure and re-torque them as recommended. Not saying you can do what ever you want but the recommended way from John Deere is to follow the manual. I been re-torqueing cylinder heads on 4020/10 and 3020/10's for best part of 40 years and never had a problem with one yet. Just follow the instruction and you will be fine. DW
 
Are the newer 4020 blocks different as far as the threads? The new bolts are offered for them, but we're not used when they were new from the factory?
 
Grade 8 bolts with washers is the upgrade bolts for early 4020/3020. Early ones originally had grade 5 bolts. As stated earlier, the threads in the block limit the bolts and torque procedure. The grade 8 bolts use an updated torque procedure from what is found in the original tech manual. There are several different bolts used on newer engines and their use and torque depends on engine and block #. Only flange head bolts marked "S"(I think) are torque to yield while other flange head use torque-turn method. I have an instruction sheet from an overhaul kit that lists all of the applications and bolts with torque procedures from Deere but it is at the shop. I can get it for you if you want just let me know.
 
The later blocks are no doubt better and later bolt are used on them but, re-torque procedures never changed on the 4020 that I am aware of. The torque yield methods on head bolts never came in until years after the 30 series. The torque methods were changed back on some of the older engines but you should follow block casting number to know/determine which method to use. A engine 400 series CTM manual will have the best information concerning which torque method and bolts to use on which block casting. If they ran the first 50 years using original methods they will work again. DW
 
you can buy 2 sets of 4430 reliance head bolts for less than the price of one set of early 4020 /4010 head bolts.the torque turn bolts marked special or 180 are about 20% stronger than grade 8 they can be torqued to the original 4430 torque of 150 ft lbs or even 180 lbs listed by reliance .Paul
 
Thank you all for your help. With the help of the service manager at my dealership we looked up the part #'s and torque specs today and got them ordered. As many if you stated the correct bolts for the early 4020 are grade 8 and will need to be re-torqued. The torque /turn style bolts are not intended to be used on this engine.
 
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