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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Small end bearings B18A

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Old Nov 18th, 2020, 14:39   #1
sleek lemur
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Default Small end bearings B18A

....while I'm bothering everyone....

Old pistons removed from conrods, the small end bearing popped out of #1 rod, but the others seem stuck fast. None of my sockets fit to use as a press (the bearings are pretty thin) Am preparing to tap them through with a screwdriver and small mallet and insert new ones.

However, looking at YouTube, it doesn't seem as easy as that, with talk of reaming and chamfering the edges of the rod before inserting bearings.

Can't see that this has been discussed on the forum before now...
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Old Nov 18th, 2020, 18:46   #2
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I've not done this job on Volvo engines yet so can't comment on the procedure.

I encourage you to read through the workshop manual.

I encourage you to not use screwdrivers to try and remove the old bearings the chances of damaging the conrods is too high.

Seeing as you have one small / little end bearing out of one conrod you could perhaps cut along its length (to make it smaller) and use this to push other bearings out. This might work - might not. You are better off finding something stronger of a suitable size and using a hydraulic press.

I imagine the conrod with the loose bearing is probably worn beyond limts. You don't want little end bearings spinning in castings.

For the age of these engines I expect reaming after fitting new bearings is necessary - but follow the instructions in the workshop manual.
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Old Nov 18th, 2020, 19:14   #3
sleek lemur
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Thanks, Army. Appreciate your comments especially on danger of bearing spinning. I want to do as much of this rebuild as I can, but it sounds like this might be one for the machine shop.
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Old Nov 18th, 2020, 20:30   #4
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I agree with Army. Take your new bearings, connecting rods and your new wrist pins / gudgeon pins to the machinist and have them remove old and insert the new bearings into the connecting rods. The should also fit the gudgeon pins to the small end bearings. At this point, depending on the required fitting the gudgeon pins may get matched to the connecting rods so have them marked so that they remain matched when you do final assembly.
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Old Nov 18th, 2020, 21:15   #5
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Building your own engine is something I think will benefit virtually every classic car owner (assuming you haven't done this sort of thing before - having to rebuild yet another engine gets a bit tedious however (!))

I hope you don't me asking but I get the impression this might be your first time.

Have you got enough supporting equipment and resources such as a clean working space (really really really important), an engine stand (not 100% necessary but helps you not drop expensive stuff on ya tootsies), DTI / clock gauges + magnetic stands, vernier capiers, feeler gauges, micrometers (bore micrometers are nice but usually a machine shop can help), torque wrenches, plasti-gauge, assemby oil, reliable scales, timing disc protractor (not 100% necessary but can be useful to get camshaft timing bang on), timing light, Volvo specific special tools, sealants and other consumables etc etc etc ??

Also how far do you want to go?

Do you want to have a gas flowed head? I assume you'll put in hardened valve seats (for most people that's a machine shop job)? Will you try to ballance and match rotating parts to better tollerances than the Volvo specifications?

If I'm barking up the wrong tree and you've done this before - I apologise in advance...
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Old Nov 18th, 2020, 22:58   #6
sleek lemur
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Ha ha, yes you are right, Army, this is my first time (blushes).

I have done most jobs on a car, but never an engine. I wanted something a bit special for my 1800E, so had a specialist do it. Now that my E is finished (famous last words), I wanted another project and not having the space for a full restoration looked about for an engine, which I found on this forum. Goodness knows when it ran last, but it turned and was a very reasonable price from a friendly fellow member.

I did have a clean garage, however after having spent a month cleaning the engine, I now need to clean the garage.

I have most of the tools I need and a friend nearby who has offered to lend me what I lack. A crane and a stand were my first additions.

There's lots of help on this forum; invaluable really, plus useful stuff on YouTube, especially Amazon Cars' videos. I want to upgrade it somewhat. A K cam seems to be the way to go, with 9.5:1 CR. But not much further than that.

I'm really appreciating the engineering quality in the motor. It's a thing of beauty. Parts are reasonably priced and availability is great.

When it's finished, maybe I'll be able to sell it (but I'm already thinking of looking for an Amazon to restore around it, who knows).

But that's for much later. Right now, I'm enjoying the journey!

Last edited by sleek lemur; Nov 18th, 2020 at 23:02.
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Old Nov 19th, 2020, 06:53   #7
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Quote:
Originally Posted by sleek lemur View Post
Ha ha, yes you are right, Army, this is my first time (blushes).

I have done most jobs on a car, but never an engine. I wanted something a bit special for my 1800E, so had a specialist do it. Now that my E is finished (famous last words), I wanted another project and not having the space for a full restoration looked about for an engine, which I found on this forum. Goodness knows when it ran last, but it turned and was a very reasonable price from a friendly fellow member.

I did have a clean garage, however after having spent a month cleaning the engine, I now need to clean the garage.

I have most of the tools I need and a friend nearby who has offered to lend me what I lack. A crane and a stand were my first additions.

There's lots of help on this forum; invaluable really, plus useful stuff on YouTube, especially Amazon Cars' videos. I want to upgrade it somewhat. A K cam seems to be the way to go, with 9.5:1 CR. But not much further than that.

I'm really appreciating the engineering quality in the motor. It's a thing of beauty. Parts are reasonably priced and availability is great.

When it's finished, maybe I'll be able to sell it (but I'm already thinking of looking for an Amazon to restore around it, who knows).

But that's for much later. Right now, I'm enjoying the journey!
Well that sounds like fun.

I hope you realise just how difficult it is to sell a rebuilt engine. I don't rate the chances of getting anything like the costs you will sink into the engine back. Most people - including myself - would be very suspicious of such a situation. I'd prefer to buy a "new engine" as a heap of new and refurbished parts so I could see the condition for myself...

...but as it sounds like the engine will be used for the next "stealth" project I encourage you to have a proper good play =>

Perhaps you'd be interested in measuring cam profiles, working out when valves will bounce, measuring and balancing rotating engine parts, porting cylinder heads, thinking about turbos and fuel injection - stand alone programable ECUs...

There's a lot of play space out there. There are a lot of tools and goodies to be bought.
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1981 Mercedes 300D <=> 230 diesel to petrol conversion project
1965 Series 2a Station Wagon mega build
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Old Nov 19th, 2020, 09:04   #8
sleek lemur
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Yes indeed. Why would a sensible person buy an engine rebuilt by a beginner? Especially if it hasn't been run?

Put it another way, though. We haven't been able to have a foreign holiday this year. I'm still net up even if I give the thing away!

Adding in the refunds I've had from gym, pool, music events, motor racing tickets, I could go on to restore a pair of SU's, a transmission, an interior......Do you remember the Johnny Cash song? "I got it one piece at a time and it didn't cost me a dime" ?

The only thing that can stop me is the development of the vaccine, which will mean life getting back to normal. I think we can all agree that this is win-win situation.

I may be a beginner at physical engineering, but financial engineering, well....
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Old Nov 19th, 2020, 13:48   #9
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Here's wishing you an enjoyable time.

Like I said above there's a whole world of interest and fun to be had.

I'm slowly moving towards electric but at the moment don't have the play money to make a serious start - still I find half of the fun is dreaming and planning
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Old Nov 19th, 2020, 15:19   #10
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Are you familiar with this?

http://www.vclassics.com/archive/engine1.htm
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