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B230F is it an interference head design or not?[ALL/1998] posted by Stoney on
Tuesday, 23 September 1997, at 10:24 p.m.
I just got the new Haynes 240 Manual and according to it the B230F engine is an interference head design-I have seen here that it is not an interference design. If the timing belt breaks will the valves launch into orbit or not? Is Haynes wrong (would not be the first time)?
VISTA TECHS please answer-abe, robert, mark, anyone???
Re: B230F is it an interference head design or not?[ALL/1998] posted by Ed Lipe on
Wednesday, 24 September 1997, at 10:57 a.m.
As per the Official Volvo service manual refering to timing belt replacement: DO NOT turn crank or camshaft with timing belt removed. Pistons and valves WILL collide. This is the only info I could find on the B230F, Hope it satisfies your curiosity.
Re: B230F is it an interference head design or not?[ALL/1998] posted by Robert on
Wednesday, 24 September 1997, at 8:31 p.m.
Stoney,
I have never seen a B230F or B230FT damage valves when the T belt breaks, and I have seen many. The B234 F is a different story. It will bend valves as will the 5cyl. and 6cyl white engines.
Robert
Re: B230F is it an interference head design or not?[ALL/1998] posted by Stoney on
Wednesday, 24 September 1997, at 10:22 p.m.
Robert-That is what I thought and now I think that Haynes 240 1976-1993 manual 97020 (270) is incorrect as in chapter 2 part A on page 2A-3 paragraph D it states "The B21 and B23 engines are non-interference designed.These engines are designed to not allow any valve/piston damage in the event the timing belt breaks of if the timing belt is installed improperly. The B230 engine IS an interference design. Take special caution when performing any type of work on the timing belt."
So I guess the mighty Haynes is incorrect and has mistaken the B-230 for the B-234 engine! I hope they haven't left me any more surprises to "discover"!
Is the Bentley manual nay better and/or more accurate?
Robert-thanks mucho!
Re: B230F is it an interference head design or not?[ALL/1998] posted by Steve Seekins on
Thursday, 25 September 1997, at 7:39 a.m.
There seems to be a lot of confusion on this issue. On many cars, inluding most Japanese makes, the engines ARE interference engines, meaning that the valves can come in contact with the pistons if the valve timing gets screwed up (i.e., timing belt breaks).
However, most of the older Volvo engines are NOT interference engines. Those that are not inlude the B16/18/20 series, the B21/23 series, and the B200/230 series including both turbos and non-turbos.
The B234 and B204 (16 valve) engines ARE interference engines and a broken timing belt will cause major damage. I believe that the B5204, B5234, and B5254 engines are also interference (these are the 850 and S/V70 2.0, 2.3, and 2.5 liter 20 valve engines). I do not know whether the 5 cylinder, 10 valve engines are interference or not (B5202 and B5252).
In any event, on the B230, you can freely turn the cam independent of the crank position with no fear of engine damage.
Steve
Volvo Club of America
Re: B230F is it an interference head design or not?[ALL/1998] posted by Ed Lipe on
Thursday, 25 September 1997, at 10:11 a.m.
Not even my local dealer can give a definite answer on this one. They say "probably not" an interference head. The Carquest belt catalog sez yes, the Volvo maintenance service manual sez yes. I'd err on the side of caution. When I bought my diesel the cam was in 3 pieces and the head had a few spare parts also. Like I always say: There's only one way to find out.
Re: B230F is it an interference head design or not?/ Thanks for input read my post...[ALL/1998] posted by Stoney on
Thursday, 25 September 1997, at 10:30 a.m.
Ed, I'd rather not discover it the hard way! Steve and Abe, thanks much for your input. I spoke with Haynes USA and they had not opinion/comment other than "So I guess you want your money back, huh?"
Anyway-I going to the Volvo Family Reunion on Oct. 4th and will buttonhole a Tech and find out the real poop!
Steve-I'll see you there! Jarrod-how about a Volvophalia t shirt to wear to the party?
BTW I'm not blaming Haynes-errors do happen and all I want to know is if the nasty deed does happen-will it make my valves/cam become a new neighbor of the MIR space station? (If so they would probably work better than the MIR!)
Re: B230F is it an interference head design or not?/ Thanks for input read my post...[ALL/1998] posted by gregg on
Saturday, 27 September 1997, at 6:34 p.m.
When I went to Volvo school for the then new b230F engine, the instructor
(Lars) told me that it was an interferance engine, but time has proven that
this is not so. Of all the cam belt snaperoos I've fixed, none of these
have ever sustained valve damage. Not to be confused with the evil B234F,
which will squeeze valves with ease.
Re: B230F is it an interference head design or not?/ Thanks for input read my post...[ALL/1998] posted by Stoney on
Sunday, 28 September 1997, at 12:26 p.m.
Thanks to all who responded! Sorry if I am/was a bit anal about it! I just hate when "Expert Manuals" don't take real world experience, like the quality advice found here, into account when writing and/or updating a non OEM Published Service manual. Hell even Chiltons will mention that even though the rules say this experience has shown this..... So I ordered the Bentley as well to CMA!