Engine Block Advice Please!

Technical questions and answers about the Mazda Bongo

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Jordan F
Junior Bongonaut
Posts: 13
Joined: Mon Jul 30, 2018 10:09 pm

Engine Block Advice Please!

Post by Jordan F » Fri Nov 30, 2018 10:12 pm

Hey everyone,

So the moment I have been working towards, and also very worried about is here. Over the last couple weeks I have been dis-assembling the engine of my 2.5L WL-T Diesel , 1997 friendee after an over heating episode. I am now at the block, ready to start re-assembling, but knew that I would have to clean and measure the block deck for its 'trueness'.

After getting a straight edge and feeler gauges I have cleaned up the block and taken measurements and it looks like I might have some warpage on the block as well as some other issues I need help clarifying.

Around cylinder 2 I am able to fit 0.0025 under the straight edge in the bridge area between cylinder 1 & 2, and the bridge area between cylinder 2 & 3. I can slightly fit the tip of the .003 gauge in these areas but cannot pass through.

You can see images at the links here:
- Cylinder 1&2 with .002 gauge https://cdn.shopify.com/s/files/1/2195/ ... 3772932433
- Cylinder 2&3 with .002 gauge https://cdn.shopify.com/s/files/1/2195/ ... 3772932433
- Zoomed Out Image https://cdn.shopify.com/s/files/1/2195/ ... 3772932433

Also of concern, around a number of the coolant passages, it seems like there are a few areas of imperfection between the surface and the passage as seen in the images below.

https://screenshot.click/30-08-dm6ao-q121b.jpg
https://screenshot.click/30-11-eehlf-9he31.jpg

SO, moving forward now, does anyone know what my options are, can I get away with these imperfections on the surface or?

I am assuming that I will need to have the block skimmed, if this is the case, how much can be skimmed off of the deck without writing off the block?

If I can get the block skimmed, are there any previous posts or directions for removing the block anywhere that someone could point me towards?



--- When this all went down a few months ago we decided to purchase a new head and all ancillaries, so I am sitting on all of this right now hoping that I can still get this working somehow.

Thanks everyone,

Jordan
Bonneville
Bongolier
Posts: 155
Joined: Wed Mar 28, 2018 10:50 am

Re: Engine Block Advice Please!

Post by Bonneville » Sat Dec 01, 2018 4:38 pm

.002 is not huge but I would deck the block, time permitting.

Nice clean block face, though, nice work!
teenmal
Supreme Being
Posts: 3656
Joined: Thu Mar 27, 2008 6:08 pm
Location: north lanarkshire

Re: Engine Block Advice Please!

Post by teenmal » Sat Dec 01, 2018 6:07 pm

This is the tolerances..

Cylinder block distortion X Direction: 0.020 mm {0.0008 in} max.

Y Direction: 0.050 mm {0.0020 in} max.

Y=length 2 measures outside cylinders.
X =width 5 measures across.



Take care
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