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-   -   93 D21 4x4 Head Gasket Advice (http://www.infamousnissan.com/forum/showthread.php?t=45267)

jp2code 03-26-2021 04:53 PM

Quote:

Originally Posted by Hoseman1958 (Post 547170)
I can't get the crank bolt to crack. I've read in earlier threads that it might be possible to crack the crank bolt by putting the truck in 4th or 5th gear and hitting a breaker bar with a hammer. This isn't working.....there is still to much "give" to allow the bolt to crack. Does anyone have any other ideas?

What I've done is loop a cargo strap around the harmonic balancer with the other end anchored to the frame. Crank down the cargo strap, and the harmonic balancer won't move, allowing you to bust that bolt lose.

That technique is common enough that I was able to find a picture online:

https://content.invisioncic.com/r277...70aeed4a9e.JPG

Source: https://forums.aaca.org/topic/301166...ancer-removal/

alabama_lowlife 03-26-2021 06:20 PM

Realistically, the only thing I can recommend is to do a compression check.

When I go to loosen the crank bolt I use a breaker bar. I place the beaker bar against the frame of the truck and briefly bump the ignition switch to start. It has enough torque to break the bolt loose. You just have to be extremely careful.

Hoseman1958 03-26-2021 06:36 PM

Quote:

Originally Posted by VOTS95 (Post 547172)
^^ I thought this was good advice.

You put the transmission in 5th gear. Have someone get in the truck and put their foot on the brake pedal while you break the crank bolt free. You can also chock the wheels. I'd put the engine at TDC before I broke it loose. Read up on replacing the HG procedure in detail before you start taking parts off.

VOTS


Thanks for the quick response.


Got a neighbor to put his foot on the brake while in 5th gear...and the crank bolt is off. Any idea where the screw holes for the harmonic balancer puller are?

jp2code 03-26-2021 06:44 PM

Quote:

Originally Posted by Hoseman1958 (Post 547181)
Any idea where the screw holes for the harmonic balancer puller are?

They are really small. M6 or M8, if they are like the V6. I wasn't able to find a puller with bolts that small, so I used a puller that had the 3 fingers.

Just be careful and don't crank too hard on it. Put a little tension on the puller and tap around the harmonic balancer with a mallet or ball peen hammer. Then put a little more tension on the puller. Tap some more with the hammer. Keep going until the harmonic balancer slides off.

Hoseman1958 03-26-2021 06:51 PM

In trying to align everything TDC, I first put a paint mark on harmonic balancer to match up with pin sticking out of timing chain cover. In doing this though, the keyhole on the cam sprocket is not pointing due north....it is pointing more like 11:00. The punch mark on the cam sprocket is at 1:00 or 2:00. The rotor is pointing to cylinder 1 and I put corresponding paint marks on both the distributor and the cylinder head. The truck was running pretty smoothly before I started all of this. Should I be concerned that the keyhole on cam sprocket is not pointing 12:00.....or should I just install the new sprocket in the 11:00 position?

VOTS95 03-26-2021 07:10 PM

I'm not familiar with getting the 4 cylinder to TDC. Use the FSM, our Stickeys, Google, Youtube, etc. and make sure you have this correct.

I've always used the three jaw puller when removing the crank pulley. Like JP says, take your time, maybe squirt some PB Blaster in behind the pulley before you begin.

https://i.imgur.com/9Q56pfHl.jpg
https://i.imgur.com/1HFjJ0fl.jpg

VOTS

Hoseman1958 03-26-2021 08:11 PM

Quote:

Originally Posted by jp2code (Post 547183)
They are really small. M6 or M8, if they are like the V6. I wasn't able to find a puller with bolts that small, so I used a puller that had the 3 fingers.

Just be careful and don't crank too hard on it. Put a little tension on the puller and tap around the harmonic balancer with a mallet or ball peen hammer. Then put a little more tension on the puller. Tap some more with the hammer. Keep going until the harmonic balancer slides off.


Thanks for the suggestions. I will adhere to them and try and post an update once I get the timing chain cover off.

amdilligaf1 03-29-2021 02:34 AM

Quote:

Originally Posted by alabama_lowlife (Post 547179)
Realistically, the only thing I can recommend is to do a compression check.

When I go to loosen the crank bolt I use a breaker bar. I place the beaker bar against the frame of the truck and briefly bump the ignition switch to start. It has enough torque to break the bolt loose. You just have to be extremely careful.

and make sure to remove your fuel pump fuse before you BRIEFLY bump the ignition.
you don't want it to start, just turn over enough to crack the nut loose.

LugNut1990 03-29-2021 03:01 AM

Never put a two/three-toed puller on an harmonic balancer (HB), nor use that strap technique. Easily can damage or destroy the HB which normally has a thin rubber layer that absorbs impulses.

alabama_lowlife 03-29-2021 11:36 AM

Several of your questions can be answered by looking at the pictures in this thread. The bolts that thread into the harmonic balancer are M6x1.0
http://www.infamousnissan.com/forum/...ad.php?t=33948


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