The guys at Kammer and kammer's machine shop filled my block with Hardblok Filler 2 years ago but earlier this summer i noticed my car was not staying as cool as it should. So i popped the radiator cap and saw "gravel" looking chunks in my radiator...i pulled the rad out, flushed it, and put it back in and thought not much more of it. Then the next week out, same cooling issues after 2 runs....i got home and popped the cap again and sure enough, more chunks. Come to find out, the hardblok was crumbling. I now have the motor apart and my water jackets look like a rock quarry. What is going on and how do i stop it? I CANT, CANT afford to just chuck the block. Any help would be greatly appreciated!
maybe get as much of the loose chunks out of the water jacket, clean block very well, and get it bone dry. Then do an epoxy fill on top of the hardblock.
No issues with Hardblok, it goes in every GM block we do. Prep is the key and mixing. I have 6 tall fill units in the shop. Never had an issue and there are gains with it!
Bad mix or block prep. That stuff and the moroso when set up properly you cant get it out. Did a couple of blocks some been running for 15 years no problems. If its coming out like you said I would try to get most of it out before doing anything else.
I had the same problem and it was the back two cylinders on mine. We didn't have any experience with the stuff when we mixed it up and short filled the block. My solution was to replace the block with one that didn't need filler.
If it's crumbling it's not doing it's job and supporting the block. I hate to say it but you're gonna have to replace the block, either now or after it fails.
It's a cement based product and there are rules to adhere to when mixing the stuff. Put too much water in it when doing the initial mix and the final set strength will be affected greatly.
I did a short fill on my block with Embecco 885. Supposed to be somewhat superior to hard block...No issues yet after one season.
I have heard that you can get block fill out of the water jackets using muriatic acid (which is the same stuff I used to thoroughly clean my water jackets before pouring the stuff).
I would be a bit leary though of pouring more fill on top of an already crumbling foundation in there, even if you cleaned all the flaked stuff out...What says the other stuff isn't going to come apart anytime soon?
I'm preparing to do a short fill on one of my 400 blocks. Hope I have better luck! I'll try and keep it on the thick side. I bought the Hardblock brand.
I'm going to use a stock 4.3 rad that has an oil cooler built in. Decided to go ahead and plumb the cooler for some insurance. Drag only no street.
simple fix,they sell an epoxy resin you can and should pour into the water jacket area
its seals it like a glove - many machine shops do this auto maticly
Muratic acid may help clean out much of the old loose stuff to give you a good solid base to seal in. Stuff stinks. I think you need to try to get out as much of the loose stuff as possible then clean it with muratic acid, let it dry good and put more hardblock or something on top to seal it in.
I have an aluminum block that is half filled. Looking into the jackets, it doesn't look like the filler is adhered to block. It looks fairly chunky and not very level as if it was lumpy when poured. What should it look like?
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Yellow Bullet Forums
23.7M posts
139.6K members
Since 2005
A forum community dedicated to drag racing drivers and enthusiasts. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more!