Info Needed On 5k Motors

[emu]

do ALL 5K motors have hydraulic tappets?

 

are 3K and 5K rocker covers and distributors identical and interchangeable ?

 

were 5K motors standard equipment on any Aust delivered cars?

 

when were 5K's first and last built approximately?

 

any help would be much appreciated, thanks pete

[67Rolla-Ken]

Yes they came with hydraulic lifters, but that can be changed. Holden/Chev V8 Lifters, Datsun A12 Pushrods, 3K rocker assy.

Yes & Yes Both are interchangeable, I'm sure someone will correct me if I'm wrong.

Yes in forklifts and Liteace Vans.

NOt a clue.

 

I hope this helps.

[Taz_Rx]

KM36: 1986 - 1992, and I think they still use 5k's in forklifts.

[Teddy]

There was a small run of 5K's that had Solid Lifters from Standard. You'd have to be pretty lucky to strike one of those these days..

[67Rolla-Ken]

Wow never knew that Teddy, damn that would have been a pleasant surprise if I'd got one of them...

 

We had a 5K fork at work, indestructable.

[emu]

Thanks very much guys

 

Teddy, by "pretty lucky", do you prefer the non hydraulic lifters? ..........And (everybody), does a 3K head fit straight onto a 5K motor?..........and if this is the case, do a lot of 5K transplants into K cars finish up with the original 3K or 4K heads?.............and does this change the compression ratio from what the original complete 5K motor had?

 

Taking this a step further, by the vintage of original 5K motors, wouldn't they be unleaded fuel suited?.......and if this is the case, 5K motors with 3 or 4K heads could possibly be not compatable with unleaded fuel ?

 

is there anyway to determine externally (by markings etc ) whether the head on a 5K motor is the original 5K head, or perhaps a 3 or 4K head ?

 

thanks again , pete

[67Rolla-Ken]

My understanding is they are a direct swap, however, the blast chamber in a 5K is in the top of the piston. For the 3-4K engines it's in the head. You don't want to swap unless you are going to supercharge or turbo the engine.

 

As far as leaded fuel, I've had heaps of cars that were made to run on leaded and always run them on unleaded. Never had any issues. You could add an additive if you're worried.

 

Only things I can see stamped on the 5K head is 1 5 and the old Toyota logo.

[emu]

My understanding is they are a direct swap, however, the blast chamber in a 5K is in the top of the piston. For the 3-4K engines it's in the head. You don't want to swap unless you are going to supercharge or turbo the engine.

 

As far as leaded fuel, I've had heaps of cars that were made to run on leaded and always run them on unleaded. Never had any issues. You could add an additive if you're worried.

 

Only things I can see stamped on the 5K head is 1 5 and the old Toyota logo.

 

 

Thanks Ken, that's extremely helpful,...............so by fitting a 3/4K head onto a 5K, you're adding an upper 3/4K blast chamber to the lower 5K blast chamber, and possibly doubling the overall blast chamber area and substantially reducing the compression ratio down to a point where it would only be suited to a turbo/supercharged conversion.

 

Would you have any idea whether you can successfully plane the 3/4K head right down to the 5K block to achieve a 9/10-1 suitable compression for a non-turbo/supercharge normal application?

 

Incidentally I agree with you on the leaded/unleaded scenario, ....I've run everything from english to european to jap motors as early as 1949 on unleaded without drama

 

Thanks again, pete

[sammo[RL]]

3 or 4K heads could possibly be not compatable with unleaded fuel ?

 

These heads came with hardened valve seats, because the are made of alloy. So they are fine to use unleaded fuel with.

[camerondownunder88]

Answers for original post:

 

No, Not all 5K are hydraulic some were solid lifter stock. These were mostly flat top piston models of the 5K yet some dished piston 5K also got solid lifters stock

 

yes, Covers and dizzy inter changeable being made for the same class of K motor. BUT there not the same I have found different advance weights in 5K dizzy out of vans prob to make more torque down low also rocker covers about a million types exist from EFI ones to no pollution controlled KE1X variants. They will all fit but just need to get one with all the hose connections you need.

 

Yes, Were standard delivery in KM36: 1986 - 1992, Can be found in forklifts also. And I have seen a few KE74 corollas around Aus that were imported they have a 5K stock in that KE7X model. But they were import a few here but not originally planned for release here.

 

Note sure on build dates my self for the 5K motor.

 

Second post of questions:

 

I'm not teddy but I liked my 5K with hydro lifters it saw 6 grand a few times and was so smooth and quiet and I found it awesome to drive with in the KE30. But that 5K is now in my sprinter with 3F solid lifters and 4Kc push rods and 3K rockers and 4K rocker posts and I can rev it really hard now but needs setting louder etc. Depends on what you want.

 

3K or 4K head on a 5K will drop the CR of the motor. Some cars here get the head swap when the motor swap is made BUT the dished piston cylinder head is far Superior to other flat top piston heads id use a 5K head anyday....matter of fact I do use a 5K head atm on my 5K. I just shaved it a little. Bumped CR from 182PSI to 200PSI made a fair amount o difference.

 

can use unleaded fuel in K motors as all run hardened valve seats even the original 1L K motor.

 

Easy to tell head difference. Small lugs cast under spark plug 1 and 4 will indicate a dished piston head (so most likely 5K as not many dished piston 4K float around here) Next look on the back of it to be a 5K head should have a steel plate bolted tot eh head (Early K motor heads had a welsh plug) Next run your finder along the top of any exhaust port if you feel a bump that sinks in if you get that it is a 3k or 4K head 5K never had the hole sunk there :y: also out side above the exhaust ports on a dished piston head they have less of a flat area machined on an angle. Also of ot os a stock 5K head will have harder valve springs then any other solid lifter K head.

 

So can't really tell if it is a 5K head BUT you can find out from above if it is a JDM head or dished piston head or normal Australian K motor head.

 

Cheers

Cameron

is there anyway to determine externally (by markings etc ) whether the head on a 5K motor is the original 5K head, or perhaps a 3 or 4K head ?

 

thanks again , pete

[philbey]

I just built a 5k with hydraulics. just quickly running it, pulled to 5k very quickly and smoothly.

 

First crank and the valve train was nice and silent....

[coln72]

hydrolics will go further than 6000rpm by the way.

[camerondownunder88]

^^^ I mentioned 6k in my post as that is all mine ever saw I my self havent pushed hydro lifters futher so I can say for 100% certain they can go or can't go high so I stop there.

 

But I do not doubt they can go much higher

 

Cameron

[emu]

That's fantastic work Cameron, and has helped me enormously, thanks indeed.

 

obviously a 5K head is the best option for a 5K block, but if a 5K head is not available,........

 

Does anyone know if the 3/4K head can be planed down successfully to give the correct Compression ratio on a 5K block for a non-turbo application?

 

Thanks pete

[philbey]

Without knowing for certain, I would say almost certainly no, by the time you've planed that much out you will have very little head left. You'd probably have to run different head bolts and all sorts of difficult shit.

 

If you run new ACL pistons with the smaller dish, and plane the block a bit as well, you might get somewhere close.

 

Why are you so hung up on the possibilty that you wont be able to get a head?